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Changes in Accumulated Other Comprehensive Income After Tax (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance ₨ 1,635,624.6   ₨ 1,176,493.3
Net unrealized gain/(loss) arising during the period 49,345.9   17,769.0
Amounts reclassified to income (8,823.1)   (1,895.5)
Balance 1,896,493.8 $ 25,155.7 1,635,624.6
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance [1]     0.0
Available for Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 10,474.3   (4,467.3)
Net unrealized gain/(loss) arising during the period 47,574.2   17,105.1
Amounts reclassified to income (8,823.1)   (1,895.5)
Balance 49,225.4 652.9 10,474.3
Available for Sale Securities | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance     (268.0)
Foreign Currency Translation Reserve      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 1,334.5   670.6
Net unrealized gain/(loss) arising during the period 1,771.7   663.9
Amounts reclassified to income 0.0   0.0
Balance 3,106.2 41.2 1,334.5
Foreign Currency Translation Reserve | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance     0.0
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 11,808.8   (3,796.7)
Balance ₨ 52,331.6 $ 694.1 11,808.8
Accumulated Other Comprehensive Income (Loss) | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance [1]     ₨ (268.0)
[1] Effective April 1, 2018, the Bank adopted ASU 2016-01 “Financial Instruments—Overall (Subtopic 825-10)(see note 19)