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Financial Instruments - Additional Information (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2016
INR (₨)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
INR (₨)
Financial Instruments [Line Items]      
Estimated fair values of bank guarantees ₨ 2,198.6 $ 33.2 ₨ 1,758.7
Margins in the form of cash and fixed deposit available to the bank to reimburse losses realized under guarantees 78,600.0    
Loan sanction, aggregate of loans contemplated that had not yet been made 429,700.0 6,500.0 628,100.0
Unconditional cancellable commitments 1,629,800.0 24,600.0 1,001,600.0
Guarantees      
Financial Instruments [Line Items]      
Guarantees, contingent liability recognized in terms of FASB ASC 450 917.7   973.3
Guarantees      
Financial Instruments [Line Items]      
Estimated fair values of bank guarantees ₨ 1,872.5 $ 28.3 ₨ 1,509.7
Minimum      
Financial Instruments [Line Items]      
Remaining tenure of guarantees outstanding 1 day    
Maximum      
Financial Instruments [Line Items]      
Remaining tenure of guarantees outstanding 16 years 10 months 24 days