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<in-bse-fin:DisclosureOfNotesOnFinancialResultsExplanatoryTextBlock contextRef="OneD">1.The standalone unaudited financial results for the quarter and nine months ended December 31, 2020 been taken on record by the Board of Directors at its meeting held on January 20, 2021.  The statutory auditors have carried out limited review of the above standalone unaudited financial results and have issued an unqualified limited review report. The results for quarter and nine months ended December 31, 2020 are extracted from the unaudited interim standalone financial statements. These standalone interim financial statements are prepared in accordance with the Indian Accounting Standards (Ind-AS) as prescribed under section 133 of the Companies Act, 2013 read with rule 3 of the Companies (Indian Accounting Standards) Rules, 2015 and amendments thereto.  n2.During the quarter ended December 31, 2020, the Company has allotted 127,735 equity shares of Rs. 2 each fully paid-up on exercise of stock options by employees, in accordance with the Company's stock option scheme.  n3.Estimation uncertainty relating to COVID-19:  nThe Company has considered internal and certain external sources of information including reliable credit reports, economic forecasts and industry reports up to the date of approval of the financial results in determining the impact on various elements of its financial results. The Company has used the principles of prudence in applying judgments, estimates and assumptions including sensitivity analysis and based on current estimates, the Company expects to fully recover the carrying amount of trade receivables including unbilled receivables, intangible assets and investments. Management of the Company has also reviewed goodwill and is of the opinion that no impairment is required at present. The eventual outcome of impact of the global health pandemic may be different from those estimated as on the date of approval of these financial results.  n4.The Code on Social Security, 2020 has been enacted, which would impact contributions by the Company towards Provident Fund and Gratuity. The effective date from which the changes are applicable is yet to be notified and the rules for quantifying the financial impact are yet to be framed. The Ministry of Labour and Employment has released draft rules for the Code on Social Security, 2020 on November 13, 2020, and has invited suggestions from stakeholders which are under active consideration by the Ministry. The Company will complete its evaluation and will give appropriate impact in its financial results in the period in which, the Code becomes effective and the related rules are published.  n5.Figures for earlier periods have been regrouped, wherever necessary.</in-bse-fin:DisclosureOfNotesOnFinancialResultsExplanatoryTextBlock>
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<in-bse-fin:DescriptionOfReportableSegment contextRef="FourReportableSegmentRevenue02D">Medical Devices</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentRevenue contextRef="FourReportableSegmentRevenue02D" unitRef="INR" decimals="-6">5106000000.00</in-bse-fin:SegmentRevenue>
<in-bse-fin:DescriptionOfReportableSegment contextRef="FourReportableSegmentRevenue03D">Plant Engineering</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentRevenue contextRef="FourReportableSegmentRevenue03D" unitRef="INR" decimals="-6">5712000000.00</in-bse-fin:SegmentRevenue>
<in-bse-fin:DescriptionOfReportableSegment contextRef="FourReportableSegmentRevenue04D">Telecom &amp; Hitech</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentRevenue contextRef="FourReportableSegmentRevenue04D" unitRef="INR" decimals="-6">7522000000.00</in-bse-fin:SegmentRevenue>
<in-bse-fin:DescriptionOfReportableSegment contextRef="FourReportableSegmentRevenue05D">Transportation</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentRevenue contextRef="FourReportableSegmentRevenue05D" unitRef="INR" decimals="-6">10870000000.00</in-bse-fin:SegmentRevenue>
<in-bse-fin:SegmentRevenue contextRef="OneD" unitRef="INR" decimals="-6">12676000000.00</in-bse-fin:SegmentRevenue>
<in-bse-fin:SegmentRevenue contextRef="FourD" unitRef="INR" decimals="-6">36610000000.00</in-bse-fin:SegmentRevenue>
<in-bse-fin:InterSegmentRevenue contextRef="OneD" unitRef="INR" decimals="-6">0.00</in-bse-fin:InterSegmentRevenue>
<in-bse-fin:InterSegmentRevenue contextRef="FourD" unitRef="INR" decimals="-6">0.00</in-bse-fin:InterSegmentRevenue>
<in-bse-fin:SegmentRevenueFromOperations contextRef="OneD" unitRef="INR" decimals="-6">12676000000.00</in-bse-fin:SegmentRevenueFromOperations>
<in-bse-fin:SegmentRevenueFromOperations contextRef="FourD" unitRef="INR" decimals="-6">36610000000.00</in-bse-fin:SegmentRevenueFromOperations>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentResults01D">Industrial Products</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="OneReportableSegmentResults01D" unitRef="INR" decimals="-6">760000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentResults02D">Medical Devices</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="OneReportableSegmentResults02D" unitRef="INR" decimals="-6">547000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentResults03D">Plant Engineering</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="OneReportableSegmentResults03D" unitRef="INR" decimals="-6">488000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentResults04D">Telecom &amp; Hitech</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="OneReportableSegmentResults04D" unitRef="INR" decimals="-6">324000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentResults05D">Transportation</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="OneReportableSegmentResults05D" unitRef="INR" decimals="-6">604000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:DescriptionOfReportableSegment contextRef="FourReportableSegmentResults01D">Industrial Products</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="FourReportableSegmentResults01D" unitRef="INR" decimals="-6">2025000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:DescriptionOfReportableSegment contextRef="FourReportableSegmentResults02D">Medical Devices</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="FourReportableSegmentResults02D" unitRef="INR" decimals="-6">1578000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:DescriptionOfReportableSegment contextRef="FourReportableSegmentResults03D">Plant Engineering</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="FourReportableSegmentResults03D" unitRef="INR" decimals="-6">1144000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:DescriptionOfReportableSegment contextRef="FourReportableSegmentResults04D">Telecom &amp; Hitech</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="FourReportableSegmentResults04D" unitRef="INR" decimals="-6">913000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:DescriptionOfReportableSegment contextRef="FourReportableSegmentResults05D">Transportation</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="FourReportableSegmentResults05D" unitRef="INR" decimals="-6">1472000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="OneD" unitRef="INR" decimals="-6">2723000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts contextRef="FourD" unitRef="INR" decimals="-6">7132000000.00</in-bse-fin:SegmentProfitLossBeforeTaxAndFinanceCosts>
<in-bse-fin:SegmentFinanceCosts contextRef="OneD" unitRef="INR" decimals="-6">103000000.00</in-bse-fin:SegmentFinanceCosts>
<in-bse-fin:SegmentFinanceCosts contextRef="FourD" unitRef="INR" decimals="-6">320000000.00</in-bse-fin:SegmentFinanceCosts>
<in-bse-fin:OtherUnallocableExpenditureNetOffUnAllocableIncome contextRef="OneD" unitRef="INR" decimals="-6">83000000.00</in-bse-fin:OtherUnallocableExpenditureNetOffUnAllocableIncome>
<in-bse-fin:DisclosureOfNotesOnSegmentsExplanatoryTextBlock contextRef="OneD">a.Segments have been identified in accordance with Indian Accounting Standards ( Ind AS ) 108 on Operating Segments, considering the risk/return profiles of the business, their organisational structure and internal reporting systems.  n  nb.Property, plant and equipment used and liabilities contracted for performing the Company's business have not been identified to any of the above reported  nsegments as the property, plant and equipment and services are used interchangeably among segments.</in-bse-fin:DisclosureOfNotesOnSegmentsExplanatoryTextBlock>
<in-bse-fin:OtherUnallocableExpenditureNetOffUnAllocableIncome contextRef="FourD" unitRef="INR" decimals="-6">373000000.00</in-bse-fin:OtherUnallocableExpenditureNetOffUnAllocableIncome>
<in-bse-fin:SegmentProfitBeforeTax contextRef="OneD" unitRef="INR" decimals="-6">2537000000.00</in-bse-fin:SegmentProfitBeforeTax>
<in-bse-fin:SegmentProfitBeforeTax contextRef="FourD" unitRef="INR" decimals="-6">6439000000.00</in-bse-fin:SegmentProfitBeforeTax>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentAssets01D">Industrial Products</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentAssets contextRef="OneReportableSegmentAssets01D" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentAssets>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentAssets02D">Medical Devices</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentAssets contextRef="OneReportableSegmentAssets02D" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentAssets>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentAssets03D">Plant Engineering</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentAssets contextRef="OneReportableSegmentAssets03D" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentAssets>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentAssets04D">Telecom &amp; Hitech</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentAssets contextRef="OneReportableSegmentAssets04D" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentAssets>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentAssets05D">Transportation</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentAssets contextRef="OneReportableSegmentAssets05D" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentAssets>
<in-bse-fin:SegmentAssets contextRef="OneD" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentAssets>
<in-bse-fin:UnAllocableAssets contextRef="OneI" unitRef="INR" decimals="-6">0.00</in-bse-fin:UnAllocableAssets>
<in-bse-fin:NetSegmentAssets contextRef="OneI" unitRef="INR" decimals="-6">0.00</in-bse-fin:NetSegmentAssets>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentLiabilities01D">Industrial Products</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentLiabilities contextRef="OneReportableSegmentLiabilities01I" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentLiabilities>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentLiabilities02D">Medical Devices</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentLiabilities contextRef="OneReportableSegmentLiabilities02I" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentLiabilities>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentLiabilities03D">Plant Engineering</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentLiabilities contextRef="OneReportableSegmentLiabilities03I" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentLiabilities>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentLiabilities04D">Telecom &amp; Hitech</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentLiabilities contextRef="OneReportableSegmentLiabilities04I" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentLiabilities>
<in-bse-fin:DescriptionOfReportableSegment contextRef="OneReportableSegmentLiabilities05D">Transportation</in-bse-fin:DescriptionOfReportableSegment>
<in-bse-fin:SegmentLiabilities contextRef="OneReportableSegmentLiabilities05I" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentLiabilities>
<in-bse-fin:SegmentLiabilities contextRef="OneI" unitRef="INR" decimals="-6">0.00</in-bse-fin:SegmentLiabilities>
<in-bse-fin:UnAllocableLiabilities contextRef="OneI" unitRef="INR" decimals="-6">0.00</in-bse-fin:UnAllocableLiabilities>
<in-bse-fin:NetSegmentLiabilities contextRef="OneI" unitRef="INR" decimals="-6">0.00</in-bse-fin:NetSegmentLiabilities>
</xbrli:xbrl>