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Financial Instruments - Summary of Details of Assets and Liabilities Considered under Level 3 Classification (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Beginning balance ₨ 793,516    
Ending balance 760,640 $ 11,684 ₨ 793,516
Beginning balance (270,821)    
Ending balance (275,294) $ (4,230) (270,821)
Level 3 [member] | Investments in equity instruments [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Beginning balance 5,303   4,907
Additions 1,851   620
Payouts 0   0
Transferred to investment in equity accounted investee (357)    
Gain/loss recognized in foreign currency translation reserve 53   (41)
Gain/loss recognized in other comprehensive income (1,165)   (183)
Finance expense recognized in consolidated statement of income 0   0
Ending balance 5,685   5,303
Level 3 [member] | Derivative Assets - Others [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Beginning balance 426   558
Payouts 0   0
Gain/loss recognized in consolidated statement of income (426)   (132)
Finance expense recognized in consolidated statement of income 0   0
Ending balance     426
Level 3 [member] | Contingent consideration [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Beginning balance (339)   (2,251)
Additions 0   0
Payouts (164)   138
Transferred to investment in equity accounted investee 0    
Gain/loss recognized in consolidated statement of income 167   1,546
Gain/loss recognized in foreign currency translation reserve (32)   198
Gain/loss recognized in other comprehensive income 0   0
Finance expense recognized in consolidated statement of income ₨ 40   30
Ending balance     ₨ (339)