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Financial instruments (Details 10) - INR (₨) ₨ in Thousands | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Financial assets at amortised cost |  |  |
Interest income on bank deposits | ₨ 45,060 | ₨ 56,134 | ₨ 32,094
Interest income from other financial assets | 28,517 | 26,700 | 161,826
Impairment loss of trade receivables | (433,723) | (755,495) | (479,747)
Financial assets at fair value through profit or loss |  |  |
Net change in fair value of derivative financial instruments gain/(loss) | (16,879) | 8,079 | 380
Financial liabilities at amortised cost |  |  |
Interest expenses on lease obligations | (185,092) | (178,300) | (171,824)
Interest expenses on borrowings from banks, others and overdrafts | ₨ (805,170) | ₨ (714,121) | ₨ (764,398)

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- Definition The amount of impairment loss recognised in profit or loss for trade receivables. [Refer: Impairment loss recognised in profit or loss; Trade receivables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in the fair value measurement of liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of interest income on deposits. [Refer: Interest income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of interest income on other financial assets. [Refer: Interest income; Other financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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