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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	May 31, 2019	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Aggregate intrinsic value of options exercised in period		$ 11,100
Proceeds from the exercise of stock options		2,706	$ 10,613
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense		$ 17,000
Unrecognized stock-based compensation expense, estimated weighted-average recognition period		2 years 1 month 6 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Unrecognized stock-based compensation expense		$ 61,100
Unrecognized stock-based compensation expense, estimated weighted-average recognition period		2 years 1 month 6 days
Weighted average grant-date fair value		$ 258.07
Fair value of units vested		$ 97,900
Restricted share unit issued		155,000
Performance Based Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share unit issued	196,580