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Financial Instruments - Summary of Foreign Currency Risk from Non-derivative Financial Instruments (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables ₨ 104,862   ₨ 105,436  
Cash and cash equivalent 158,529 $ 2,292 44,925 ₨ 52,710
Other assets 58,715   46,322  
Loans, borrowings and bank overdrafts (99,467)   (138,259)  
Currency risk [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 62,088   54,906  
Unbilled receivables 14,965   25,694  
Contract assets 10,005      
Cash and cash equivalent 31,589   17,681  
Other assets 20,397   26,413  
Loans, borrowings and bank overdrafts (50,611)   (49,637)  
Trade payables, accrued expenses and other liabilities (42,746)   (38,591)  
Net assets/ (liabilities) 45,687   36,466  
U.S.Dollar [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 39,896   32,948  
Unbilled receivables 8,038   13,893  
Contract assets 4,706      
Cash and cash equivalent 21,997   9,144  
Other assets 8,553   13,796  
Loans, borrowings and bank overdrafts (50,516)   (49,257)  
Trade payables, accrued expenses and other liabilities (27,202)   (23,561)  
Net assets/ (liabilities) (5,472)   (3,037)  
EURO [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 8,030   7,273  
Unbilled receivables 1,609   2,571  
Contract assets 1,445      
Cash and cash equivalent 2,884   3,791  
Other assets 1,173   1,993  
Loans, borrowings and bank overdrafts (20)   (41)  
Trade payables, accrued expenses and other liabilities (5,779)   (3,962)  
Net assets/ (liabilities) 9,342   11,625  
Great British Pound [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 5,212   6,585  
Unbilled receivables 3,146   5,189  
Contract assets 2,270      
Cash and cash equivalent 1,573   1,685  
Other assets 4,056   4,061  
Loans, borrowings and bank overdrafts (21)   (37)  
Trade payables, accrued expenses and other liabilities (4,646)   (5,958)  
Net assets/ (liabilities) 11,590   11,525  
Australian Dollar [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 3,542   3,459  
Unbilled receivables 1,225   2,094  
Contract assets 836      
Cash and cash equivalent 1,003   786  
Other assets 1,038   1,164  
Loans, borrowings and bank overdrafts (33)   (165)  
Trade payables, accrued expenses and other liabilities (1,526)   (1,516)  
Net assets/ (liabilities) 6,085   5,822  
Canadian Dollar [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 1,528   990  
Unbilled receivables 204   338  
Contract assets 150      
Cash and cash equivalent 1,928   34  
Other assets 1,033   940  
Trade payables, accrued expenses and other liabilities (806)   (652)  
Net assets/ (liabilities) 4,037   1,650  
Other currencies [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 3,880   3,651  
Unbilled receivables 743   1,609  
Contract assets 598      
Cash and cash equivalent 2,204   2,241  
Other assets 4,544   4,459  
Loans, borrowings and bank overdrafts (21)   (137)  
Trade payables, accrued expenses and other liabilities (2,787)   (2,942)  
Net assets/ (liabilities) ₨ 9,161   ₨ 8,881