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Goodwill and Intangible Assets - Summary of Movement in Intangible Assets (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Disclosure of detailed information about intangible assets [line items]      
Beginning balance ₨ 15,922    
Ending balance 18,113 $ 278 ₨ 15,922
Carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 26,807   20,947
Translation adjustment 596   (860)
Acquisition through business combinations 5,734   6,720
Ending balance 33,137   26,807
Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 10,885   5,106
Translation adjustment 25   (75)
Amortization and impairment 4,114   5,854
Ending balance 15,024   10,885
Customer related intangibles [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 11,264    
Ending balance 14,323   11,264
Customer related intangibles [member] | Carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 20,528   18,360
Translation adjustment 493   (546)
Acquisition through business combinations 5,565   2,714
Ending balance 26,586   20,528
Customer related intangibles [member] | Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 9,264   4,164
Translation adjustment 14   (7)
Amortization and impairment 2,985   5,107
Ending balance 12,263   9,264
Marketing related intangibles [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 4,658    
Ending balance 3,790   4,658
Marketing related intangibles [member] | Carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 6,279   2,587
Translation adjustment 103   (314)
Acquisition through business combinations 169   4,006
Ending balance 6,551   6,279
Marketing related intangibles [member] | Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 1,621   942
Translation adjustment 11   (68)
Amortization and impairment 1,129   747
Ending balance ₨ 2,761   ₨ 1,621