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Share Based Payment - Summary of Measurement Used to Determine Fair Values of ESOPs (Detail) - Employee Stock Options [Member]
12 Months Ended
Mar. 31, 2020
USD ($)
yr
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Share price at grant date (USD) | $ / shares $ 2,302
Exercise price (USD) | $ / shares $ 2,229
Risk-free interest rate 1.50%
Bottom of Range [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Fair value at grant date (USD) | $ $ 722
Expected volatility 43.80%
Expected term | yr 3
Top of Range [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Fair value at grant date (USD) | $ $ 1,014
Expected volatility 49.00%
Expected term | yr 5