Intangible Assets - Additional Information (Detail) ₨ in Millions, $ in Millions |
12 Months Ended | |
|---|---|---|
|
Mar. 31, 2026
INR (₨)
|
Mar. 31, 2026
USD ($)
|
|
| Disclosure of detailed information about intangible assets [line items] | ||
| Term of agreement based on which discount rate is applied | 25 years | 25 years |
| Impairment loss recognised in profit or loss, intangible assets other than goodwill | ₨ 812 | $ 9 |
| Ostro Energy Group [member] | ||
| Disclosure of detailed information about intangible assets [line items] | ||
| Impairment loss recognised in profit or loss, intangible assets other than goodwill | $ 812 | |
| Bottom of range [member] | ||
| Disclosure of detailed information about intangible assets [line items] | ||
| Term of agreement based on which discount rate is applied | 12 years | 12 years |
| Top of range [member] | ||
| Disclosure of detailed information about intangible assets [line items] | ||
| Term of agreement based on which discount rate is applied | 18 years | 18 years |