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Financial Instruments - Summary of Reconciliation Fair Value Measurements in Level 3 of Fair Value Hierarchy (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Total gains and losses recognized in:      
Equity instruments at FVOCI - net change in fair value, net of tax $ 1,825 $ (1,979) $ (508)
Other Liabilities Related to Business Combination [Member]      
Disclosure Of Financial Instruments [Line Items]      
Acquired through business combination (refer note 7)   14,550  
Level 3 [Member]      
Disclosure Of Financial Instruments [Line Items]      
Opening balances 14,921    
Total gains and losses recognized in:      
Closing balances 14,875 14,921  
Opening balances 3,584    
Total gains and losses recognized in:      
Closing balances 5,409 3,584  
Level 3 [Member] | Other Liabilities Related to Business Combination [Member]      
Disclosure Of Financial Instruments [Line Items]      
Opening balances 14,921    
Total gains and losses recognized in:      
—profit or loss (350) 1,421  
-effect of movements in foreign exchange rates 304 (1,050)  
Closing balances 14,875 14,921  
Level 3 [Member] | Other Investments Equity Securities FVOCI [Member]      
Total gains and losses recognized in:      
Opening balances 3,584 5,563  
Total gains and losses recognized in:      
Equity instruments at FVOCI - net change in fair value, net of tax 1,825 (1,979)  
Closing balances $ 5,409 3,584 5,563
Level 3 [Member] | Right to Receive Equity Stake in Travel Entity [Member]      
Total gains and losses recognized in:      
Opening balances   411  
Total gains and losses recognized in:      
—profit or loss   30  
Settlement by issuance of shares (refer note 24)   $ (441)  
Closing balances     $ 411