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Financial Instruments - Summary of Foreign Currency Risk from Non-derivative Financial Instruments (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables ₨ 105,436   ₨ 98,844  
Unbilled revenues 42,486 $ 653 45,095  
Cash and cash equivalent 44,925 $ 690 52,710 ₨ 99,049
Other assets 46,322   47,544  
Loans and borrowings (138,259)   (142,412)  
Currency risk [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 54,906   50,784  
Unbilled revenues 25,694   28,621  
Cash and cash equivalent 17,681   18,513  
Other assets 5,613   5,174  
Loans and borrowings (49,637)   (60,929)  
Trade payables, accrued expenses and other liabilities (38,103)   (35,260)  
Net assets/ (liabilities) 16,154   6,903  
U.S.Dollar [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 32,948   33,388  
Unbilled revenues 13,893   15,839  
Cash and cash equivalent 9,144   15,752  
Other assets 1,879   1,612  
Loans and borrowings (49,257)   (58,785)  
Trade payables, accrued expenses and other liabilities (23,561)   (22,339)  
Net assets/ (liabilities) (14,954)   (14,533)  
EURO [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 7,273   4,663  
Unbilled revenues 2,571   2,801  
Cash and cash equivalent 3,791   1,178  
Other assets 1,993   1,437  
Loans and borrowings (41)   (494)  
Trade payables, accrued expenses and other liabilities (3,474)   (4,284)  
Net assets/ (liabilities) 12,113   5,301  
Great British Pound [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 6,585   5,078  
Unbilled revenues 5,189   4,454  
Cash and cash equivalent 1,685   571  
Other assets 285   190  
Loans and borrowings (37)   (604)  
Trade payables, accrued expenses and other liabilities (5,958)   (4,605)  
Net assets/ (liabilities) 7,749   5,084  
Australian Dollar [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 3,459   2,547  
Unbilled revenues 2,094   2,024  
Cash and cash equivalent 786   335  
Other assets 1,122   1,568  
Loans and borrowings (165)   (537)  
Trade payables, accrued expenses and other liabilities (1,516)   (1,453)  
Net assets/ (liabilities) 5,780   4,484  
Canadian Dollar [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 990   890  
Unbilled revenues 338   577  
Cash and cash equivalent 34   2  
Other assets 1   7  
Trade payables, accrued expenses and other liabilities (652)   (443)  
Net assets/ (liabilities) 711   1,033  
Other currencies [member]        
Disclosure of foreign currency exchange risk on financial instruments [line items]        
Trade receivables 3,651   4,218  
Unbilled revenues 1,609   2,926  
Cash and cash equivalent 2,241   675  
Other assets 333   360  
Loans and borrowings (137)   (509)  
Trade payables, accrued expenses and other liabilities (2,942)   (2,136)  
Net assets/ (liabilities) ₨ 4,755   ₨ 5,534