Business combination - Schedule of Purchase Consideration of Cash Flows (Detail) - 3E NV - INR (₨) ₨ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
Jun. 30, 2025 |
Mar. 31, 2026 |
Mar. 31, 2025 |
Jul. 01, 2025 |
|
| Disclosure of detailed information about business combination [line items] | ||||
| Cash consideration paid | ₨ 3,915 | ₨ 0 | ₨ 3,915 | |
| Less: cash balances acquired | (107) | |||
| Cash acquired on acquisition of control in jointly controlled entities | ₨ 107 | ₨ 107 | ||