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Financial Instruments - Summary of Aggregate Contracted Principal Amounts of Company's Derivative Contracts Outstanding (Parenthetical) (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($)
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At fair value [member] |  |  |  |
Disclosure of derivative contract outstanding [line items] |  |  |  |
Non-designated derivative instruments | ₨ | ₨ (4,344) |  | ₨ 3,794 |
At fair value [member] | Philippines, Pesos | Sell: Forward contracts [member] |  |  |  |
Disclosure of derivative contract outstanding [line items] |  |  |  |
Non-designated derivative instruments |  | $ 176 |  |
At fair value [member] | Top of range [member] |  |  |  |
Disclosure of derivative contract outstanding [line items] |  |  |  |
Designated derivative instruments | ₨ | ₨ 1 |  |  |
At cost [member] | Sell: Forward contracts [member] |  |  |  |
Disclosure of derivative contract outstanding [line items] |  |  |  |
Non-designated derivative instruments |  | $ 1,314 |  | $ 1,182
At cost [member] | Philippines, Pesos | Sell: Forward contracts [member] |  |  |  |
Disclosure of derivative contract outstanding [line items] |  |  |  |
Non-designated derivative instruments |  |  |  | $ 117

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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition Disclosure of derivative contract outstanding. + References No definition available. + Details
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- Definition Financial instruments non designated as hedging instruments, at fair value. + References No definition available. + Details
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