Trade payables (Parenthetical) (Details) - INR (₨) ₨ in Millions	Mar. 31, 2026	Mar. 31, 2025
Disclosure Of Trade And Other Payables [Abstract]
Trade advances	₨ 46	₨ 52

The amount of current advances made to suppliers before goods or services are received.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

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