Other Income - Summary of Other Income (Parenthetical) (Detail) ₨ in Millions	Mar. 31, 2026 INR (₨)
Other Income Expense [Abstract]
Gain on foreign currency translation reserve recycled	₨ 428

A component of equity representing the accumulated change in the value of foreign currency basis spreads of financial instruments when excluding them from the designation of these financial instruments as hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 9
-IssueDate 2025-01-01
-Paragraph 6.5.16
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_6.5.16&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 78
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_78_e&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_ReserveOfChangeInValueOfForeignCurrencyBasisSpreads
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant