Long Term Debt and Related Contractual Rates and Maturity Dates (Detail) ₨ in Millions, $ in Millions	12 Months Ended
Mar. 31, 2015 INR (₨)	Mar. 31, 2014 INR (₨)	Mar. 31, 2015 USD ($)
Debt Instrument [Line Items]
Total	₨ 457,934.4	₨ 395,208.6	$ 7,349.3
Subordinated debt \| Lower tier II capital \| Fixed Rate
Debt Instrument [Line Items]
Maturity /Call dates, start	2016	2015
Maturity /Call dates, end	2025	2024
Stated interest rates, minimum	6.00%	5.90%
Stated interest rates, maximum	10.70%	10.70%
Total	₨ 133,440.0	₨ 132,580.0	2,141.6
Subordinated debt \| Upper tier II capital \| Fixed Rate
Debt Instrument [Line Items]
Maturity /Call dates, start	2016	2016
Maturity /Call dates, end	2021	2021
Stated interest rates, minimum	8.70%	8.70%
Stated interest rates, maximum	10.85%	10.85%
Total	₨ 34,159.0	₨ 34,159.0	548.2
Subordinated debt \| Upper tier II capital \| Variable Rate
Debt Instrument [Line Items]
Maturity /Call dates, start	2016	2016
Maturity /Call dates, end	2017	2017
Total	₨ 6,250.0	₨ 5,991.5	$ 100.3
Subordinated debt \| Upper tier II capital \| Perpetual debt
Debt Instrument [Line Items]
Maturity /Call dates, start	2016	2016
Maturity /Call dates, end	2017	2017
Stated interest rates	9.92%	9.92%	9.92%
Total	₨ 2,000.0	₨ 2,000.0	$ 32.1
Subordinated debt \| London Interbank Offered Rate (LIBOR) \| Upper tier II capital \| Variable Rate
Debt Instrument [Line Items]
Stated interest rates, margin on LIBOR rate	1.2	1.2
Others \| Variable rate-(1)
Debt Instrument [Line Items]
Maturity /Call dates, start	2016	2015
Maturity /Call dates, end	2018	2018
Stated interest rates, minimum	1.50%	1.25%
Stated interest rates, maximum	2.59%	3.00%
Total	₨ 49,375.0	₨ 129,708.4	792.3
Others \| Variable rate-(2)
Debt Instrument [Line Items]
Maturity /Call dates, start	2016	2015
Maturity /Call dates, end	2019	2018
Stated interest rates, minimum	9.95%	10.25%
Stated interest rates, maximum	10.55%	11.35%
Total	₨ 72,737.8	₨ 57,299.7	1,167.4
Others \| Fixed rate-(1)
Debt Instrument [Line Items]
Maturity /Call dates, start	2016	2015
Maturity /Call dates, end	2025	2019
Stated interest rates, minimum	8.45%	8.54%
Stated interest rates, maximum	10.81%	10.81%
Total	₨ 83,950.0	₨ 33,470.0	1,347.3
Others \| Fixed rate-(2)
Debt Instrument [Line Items]
Maturity /Call dates, start	2016
Maturity /Call dates, end	2018
Stated interest rates, minimum	1.11%
Stated interest rates, maximum	4.30%
Total	₨ 76,022.6		$ 1,220.1

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Contractual interest rate for funds borrowed, under the debt agreement.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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