Income Taxes - Reconciliation of Beginning and Ending Balance of Unrecognized Tax Benefits (Detail) ₨ in Millions, $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
|
Mar. 31, 2026
INR (₨)
|
Mar. 31, 2026
USD ($)
|
Mar. 31, 2025
INR (₨)
|
Mar. 31, 2024
INR (₨)
|
|
| Income Tax Contingency [Line Items] | ||||
| Opening balance | ₨ 6,717.3 | $ 71.5 | ₨ 22,042.3 | ₨ 48,792.1 |
| Increase related to acquisition of eHDFC | 0.0 | 0.0 | 0.0 | 52,980.5 |
| Decrease related to prior year tax positions | (726.1) | (7.7) | (16,515.6) | (80,874.4) |
| Increase related to current year tax positions | 212.5 | 2.3 | 1,190.6 | 1,144.1 |
| Closing balance | ₨ 6,203.7 | $ 66.1 | ₨ 6,717.3 | ₨ 22,042.3 |