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Financial Instruments - Summary of Financial Assets and Liabilities (Parenthetical) (Detail) - INR (₨) ₨ in Millions	Mar. 31, 2019	Mar. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Unbilled receivables	₨ 22,880	₨ 42,486
Fixed-price contracts [member]
Disclosure of detailed information about financial instruments [line items]
Unbilled receivables	₨ 15,038

X

- Definition

The amount of asset representing income that has been earned but is not yet received.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_TypesOfContractsAxis=ifrs-full_FixedpriceContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: