Gratuity and other post-employment benefit plans - Summary of Maturity Analysis of Defined Benefit Payments (Detail) ₨ in Millions, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Mar. 31, 2025
INR (₨)
|
Mar. 31, 2025
USD ($)
|
Mar. 31, 2024
INR (₨)
|
|
| Within next 12 months [Member] | |||
| Disclosure of Information About Maturity Profile of Defined Benefit Obligation [Line Items] | |||
| Cash flow | ₨ 52 | $ 1 | ₨ 33 |
| From 2nd to 5th year [Member] | |||
| Disclosure of Information About Maturity Profile of Defined Benefit Obligation [Line Items] | |||
| Cash flow | 192 | 2 | 127 |
| From 6th to 9th year [Member] | |||
| Disclosure of Information About Maturity Profile of Defined Benefit Obligation [Line Items] | |||
| Cash flow | 117 | 1 | 122 |
| From 10th year and beyond [Member] | |||
| Disclosure of Information About Maturity Profile of Defined Benefit Obligation [Line Items] | |||
| Cash flow | ₨ 108 | $ 1 | ₨ 299 |