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Financial Instruments - Additional Information (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Financial Instruments [Line Items]      
Estimated fair values of bank guarantees ₨ 3,231.5 $ 49.6 ₨ 2,679.4
Margins in the form of cash and fixed deposit available to the bank to reimburse losses realized under guarantees 103,900.0   73,200.0
Outstanding Undrawn commitments to provide loans and financing to customers 452,000.0 6,900.0 419,000.0
Unconditional cancellable commitments 2,738,500.0 42,100.0 2,159,000.0
Guarantees      
Financial Instruments [Line Items]      
Guarantees, contingent liability recognized in terms of FASB ASC 450 2,545.2   977.2
Guarantees      
Financial Instruments [Line Items]      
Estimated fair values of bank guarantees ₨ 2,825.4 $ 43.4 ₨ 2,339.2
Minimum      
Financial Instruments [Line Items]      
Remaining tenure of guarantees outstanding 1 day    
Maximum      
Financial Instruments [Line Items]      
Remaining tenure of guarantees outstanding 14 years 10 months 24 days