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Financial Instruments - Summary of Maximum Exposure to Credit Risk (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure $ 477,255 $ 223,886
Trades and other receivables [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 27,331 56,065
Trades and other receivables [Member] | India [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 23,571 48,758
Trades and other receivables [Member] | Thailand [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 1,324 3,901
Trades and other receivables [Member] | Malaysia [member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 157 318
Trades and other receivables [Member] | Singapore [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 188 562
Trades and other receivables [Member] | Others [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 2,091 2,526
Receivable from related party [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 55  
Term deposits [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 154,868 38,030
Cash and cash equivalents [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 295,001 129,791
Trade and other receivables, term deposits [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 182,199 94,095
Trade and other receivables, term deposits [Member] | Airlines [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 6,239 16,564
Trade and other receivables, term deposits [Member] | Retail customers [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 117 3,145
Trade and other receivables, term deposits [Member] | Corporate customers [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 10,757 26,625
Trade and other receivables, term deposits [Member] | Deposit With Hotels And Others [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 5,900 8,152
Trade and other receivables, term deposits [Member] | Term deposits with bank [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure 154,868 38,030
Trade and other receivables, term deposits [Member] | Others [Member]    
Disclosure Of Financial Assets [Line Items]    
Maximum credit exposure $ 4,318 $ 1,579