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Operating Segments - Summary of Reportable Segments (Detail) (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure of operating segments [Line Items]      
Loyalty program costs excluded from service cost [1] $ 91 $ 5,053 $ 2,467
All Other Segments [Member]      
Disclosure of operating segments [Line Items]      
Loyalty program costs excluded from service cost $ 91 $ 5,053 $ 2,467
[1] Certain loyalty program costs excluded from service cost amounting to USD 91 (March 31, 2020: USD 5,053 and March 31, 2019: USD 2,467) for “All other segments”.