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Foreign Currency Translation Reserve - Summary of Movement in Foreign Currency Translation Reserve Attributable to Equity Holders (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Disclosure of foreign currency translation reserves [line items]        
Balance at the beginning of the year ₨ 485,346   ₨ 522,695 ₨ 467,384
Translation difference related to foreign operations, net 3,238 $ 47 3,576 (3,354)
Change in effective portion of hedges of net investment in foreign operations (287) (4) (49) 276
Total comprehensive income for the year 91,196 1,317 76,975 87,241
Balance at the end of the year 570,753 8,252 485,346 522,695
Hosted data center services business [member]        
Disclosure of foreign currency translation reserves [line items]        
Reclassification of foreign currency translation differences to profit and loss on sale of business 4,131      
Workday business [member]        
Disclosure of foreign currency translation reserves [line items]        
Reclassification of foreign currency translation differences to profit and loss on sale of business 79      
Foreign currency translation reserve [member]        
Disclosure of foreign currency translation reserves [line items]        
Balance at the beginning of the year 16,618   13,107 16,116
Translation difference related to foreign operations, net 3,129   3,560  
Change in effective portion of hedges of net investment in foreign operations (287)   (49)  
Total comprehensive income for the year (1,368)   3,511 (3,009)
Balance at the end of the year 15,250 $ 221 ₨ 16,618 ₨ 13,107
Foreign currency translation reserve [member] | Hosted data center services business [member]        
Disclosure of foreign currency translation reserves [line items]        
Reclassification of foreign currency translation differences to profit and loss on sale of business (4,131)      
Foreign currency translation reserve [member] | Workday business [member]        
Disclosure of foreign currency translation reserves [line items]        
Reclassification of foreign currency translation differences to profit and loss on sale of business ₨ (79)