Other equity - Summary of Foreign Currency Translation Reserve (Detail) ₨ in Millions, $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
|
Mar. 31, 2025
INR (₨)
|
Mar. 31, 2025
USD ($)
|
Mar. 31, 2024
INR (₨)
|
Mar. 31, 2023
INR (₨)
|
|
| Disclosure Of Detailed Information About Reserve Of Exchange Differences On Translation Of Equity [Line Items] | ||||
| Beginning balance | ₨ 121,697 | ₨ 118,400 | ₨ 126,373 | |
| Ending balance | 131,112 | $ 1,535 | 121,697 | 118,400 |
| Reserve of exchange differences on translation | ||||
| Disclosure Of Detailed Information About Reserve Of Exchange Differences On Translation Of Equity [Line Items] | ||||
| Beginning balance | 474 | 547 | 201 | |
| Exchange differences on translation of foreign operations | 87 | (68) | 345 | |
| Allocation to non controlling interest | 4 | (5) | 1 | |
| Ending balance | ₨ 565 | $ 7 | ₨ 474 | ₨ 547 |