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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 ($)	Mar. 31, 2019 INR (₨)	Mar. 31, 2019 USD ($)
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

X

- 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

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- Definition

Disclosure of derivative contract outstanding.

+ References

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- Definition

Financial instruments non designated as hedging instruments, at fair value.

+ References

No definition available.

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