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Movement in Provision for Credit Card and Debit Card Reward Points (Detail) - Debit and Credit Cards Reward Points
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2015
INR (₨)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
INR (₨)
Commitments and Contingencies Disclosure [Line Items]      
Opening provision of reward points ₨ 1,509.1 $ 24.2 ₨ 1,300.7
Provision made during the year 1,066.8 17.1 1,008.9
Utilization/write back of provision (637.6) (10.2) (577.2)
Closing provision of reward points 2,000.7 32.1 1,509.1
Change in Rate of Accrual of Reward Points      
Commitments and Contingencies Disclosure [Line Items]      
Effect of change in rate of accrual of points/cost of reward (408.3) (6.6) (223.3)
Change in Cost of Reward Points      
Commitments and Contingencies Disclosure [Line Items]      
Effect of change in rate of accrual of points/cost of reward ₨ 470.7 $ 7.6 ₨ 0.0