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Property, Plant and Equipment - Disclosure of Summary about Property, Plant and Equipment (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Apr. 01, 2019
INR (₨)
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance ₨ 70,601      
Capital work-in-progress 20,348   ₨ 22,773  
Ending balance 81,120 $ 1,076 70,601  
Carrying value [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 141,006   132,915  
Reclassified on adoption of IFRS 16       ₨ (3,420)
Translation adjustment 1,654   594  
Additions 26,254   15,106  
Additions through Business combinations 429      
Disposals (4,279)   (7,609)  
Ending balance 161,644   141,006  
Carrying value [member] | Adjustment On Adoption Of IFRS Sixteen [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 137,586      
Ending balance     137,586  
Accumulated depreciation and amortisation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 93,178   83,638  
Reclassified on adoption of IFRS 16       (2,177)
Translation adjustment 1,187   331  
Depreciation and impairment [1] 11,678   14,999  
Disposals (2,994)   (5,790)  
Ending balance 100,872   93,178  
Accumulated depreciation and amortisation [member] | Adjustment On Adoption Of IFRS Sixteen [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 91,001      
Ending balance     91,001  
Land [member] | Carrying value [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 3,697   3,637  
Translation adjustment 9   (5)  
Additions 55   65  
Ending balance 3,761   3,697  
Land [member] | Carrying value [member] | Adjustment On Adoption Of IFRS Sixteen [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 3,697      
Ending balance     3,697  
Buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 6,715      
Ending balance     6,715  
Buildings [member] | Carrying value [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 27,490   25,145  
Translation adjustment 84   (8)  
Additions 9,130   2,684  
Additions through Business combinations 5      
Disposals (199)   (331)  
Ending balance 36,510   27,490  
Buildings [member] | Carrying value [member] | Adjustment On Adoption Of IFRS Sixteen [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 27,490      
Ending balance     27,490  
Buildings [member] | Accumulated depreciation and amortisation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 6,715   5,824  
Translation adjustment 32   8  
Depreciation and impairment [1] 1,319   1,034  
Disposals (118)   (151)  
Ending balance 7,948   6,715  
Buildings [member] | Accumulated depreciation and amortisation [member] | Adjustment On Adoption Of IFRS Sixteen [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 6,715      
Ending balance     6,715  
Plant and machinery [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance [2] 73,188      
Ending balance [2]     73,188  
Plant and machinery [member] | Carrying value [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance [2] 92,366   87,222  
Reclassified on adoption of IFRS 16 [2]       (3,420)
Translation adjustment [2] 1,437   613  
Additions [2] 13,571   10,402  
Additions through Business combinations [2] 417      
Disposals [2] (3,676)   (5,871)  
Ending balance [2] 100,695   92,366  
Plant and machinery [member] | Carrying value [member] | Adjustment On Adoption Of IFRS Sixteen [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance [2] 88,946      
Ending balance [2]     88,946  
Plant and machinery [member] | Accumulated depreciation and amortisation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance [2] 73,188   65,325  
Reclassified on adoption of IFRS 16 [2]       ₨ (2,177)
Translation adjustment [2] 1,066   332  
Depreciation and impairment [1] 8,628 [2]   12,298  
Disposals [2] (2,649)   (4,767)  
Ending balance [2] 78,056   73,188  
Plant and machinery [member] | Accumulated depreciation and amortisation [member] | Adjustment On Adoption Of IFRS Sixteen [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance [2] 71,011      
Ending balance [2]     71,011  
Furniture fixtures and equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 12,593      
Ending balance     12,593  
Furniture fixtures and equipment [member] | Carrying value [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 16,505   15,772  
Translation adjustment 129      
Additions 3,487   1,951  
Additions through Business combinations 7      
Disposals (258)   (1,218)  
Ending balance 19,870   16,505  
Furniture fixtures and equipment [member] | Carrying value [member] | Adjustment On Adoption Of IFRS Sixteen [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 16,505      
Ending balance     16,505  
Furniture fixtures and equipment [member] | Accumulated depreciation and amortisation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 12,593   11,983  
Translation adjustment 91   (6)  
Depreciation and impairment [1] 1,556   1,363  
Disposals (99)   (747)  
Ending balance 14,141   12,593  
Furniture fixtures and equipment [member] | Accumulated depreciation and amortisation [member] | Adjustment On Adoption Of IFRS Sixteen [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 12,593      
Ending balance     12,593  
Vehicles [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 682      
Ending balance     682  
Vehicles [member] | Carrying value [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 948   1,139  
Translation adjustment (5)   (6)  
Additions 11   4  
Disposals (146)   (189)  
Ending balance 808   948  
Vehicles [member] | Carrying value [member] | Adjustment On Adoption Of IFRS Sixteen [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 948      
Ending balance     948  
Vehicles [member] | Accumulated depreciation and amortisation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 682   506  
Translation adjustment (2)   (3)  
Depreciation and impairment [1] 175   304  
Disposals (128)   (125)  
Ending balance 727   682  
Vehicles [member] | Accumulated depreciation and amortisation [member] | Adjustment On Adoption Of IFRS Sixteen [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance ₨ 682      
Ending balance     ₨ 682  
[1] Includes impairment charge on software platform recognized on acquisitions, amounting to Nil, ₹1,480 and Nil, for the year ended March 31, 2018, 2019 and 2020, respectively, is included in cost of revenues in the consolidated statement of income.
[2] Including net carrying value of computer equipment and software amounting to ₹ 16,375 and ₹ 16,844, as at March 31, 2019 and 2020, respectively.