Business combination - Schedule Of Combined Entity Revenue And (Loss) / Profit Before Tax Beginning of the Year (Detail) - 3E NV ₨ in Millions	12 Months Ended
Mar. 31, 2026 INR (₨)
Disclosure of detailed information about business combination [line items]
Revenue	₨ 2,212
Loss before tax	₨ (499)

The profit (loss) of the combined entity as though the acquisition date for all business combinations that occurred during the year had been as of the beginning of the annual reporting period. [Refer: Total for all business combinations [member]; Profit (loss)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2025-01-01
-Paragraph B64
-Subparagraph q
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B64_q_ii&doctype=Appendix&subtype=B
-URIDate 2025-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration