Employee Benefits - Summary of Principal Assumptions Used for Purpose of Actuarial Valuation of Defined Benefit Plans (Detail) |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Disclosure of actuarial assumptions [line items] | ||
| Discount rate | 5.70% | 5.75% |
| Expected return on plan assets | 5.70% | 5.75% |
| Expected rate of salary increase | 6.44% | 6.40% |
| Weighted average duration of defined benefit obligations | 6 years 6 months 10 days | 7 years 10 days |
| Provident fund [member] | ||
| Disclosure of actuarial assumptions [line items] | ||
| Discount rate | 6.50% | 6.55% |
| Weighted average remaining tenure of investment portfolio | 13 years 9 months 21 days | 6 years 8 months 15 days |
| Guaranteed rate of return | 8.25% | 8.25% |