Trade receivables (Details 1) - INR (₨) ₨ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Disclosure of Allowance for doubtful accounts receivable [Abstract]
Balance at the beginning of the year	₨ 658	₨ 580
Add : Additional provision, net	164	195
Less : Bad debts written off	(396)	(118)
Add/(Less) : Effect of forex Adjustment	6	1
Balance at the end of the year	₨ 432	₨ 658

The increase (decrease) in financial assets resulting from foreign exchange. [Refer: Financial assets]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph IG20B
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_IG20B&doctype=Implementation%20Guidance
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 35H
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35H&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_IncreaseDecreaseThroughForeignExchangeFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration