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Stock Award Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised in period				$ 15,000	$ 174,000	$ 66,400
Proceeds from the exercise of stock options				$ 3,748	$ 12,949	$ 9,303
Expected dividend yield				0.00%
2015 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option conversion description				Each share of stock issued pursuant to a stock option or stock appreciation right counts as one share against the maximum number of shares issuable under the 2015 Plan, while each share of stock issued pursuant to any other type of award counts as 1.8 shares against the maximum number of shares issuable under the 2015 Plan.
Shares available for future issuance under the Plan				3,609,512
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award plans, outstanding stock options expiration period				10 years
Vesting period				3 years
Unrecognized stock-based compensation expense				$ 12,900
Unrecognized stock-based compensation expense, weighted-average recognition period				1 year 9 months 18 days
Expected dividend yield				0.00%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Unrecognized stock-based compensation expense				$ 23,800
Unrecognized stock-based compensation expense, weighted-average recognition period				1 year 6 months
Weighted average grant-date fair value				$ 258.59	$ 376.95	$ 137.40
Fair value of units vested				$ 99,300	$ 171,300	$ 51,000
Restricted share unit issued				161,000
Non-vested shares, outstanding				320,000	620,000
Performance and Market-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense				$ 4,500
Unrecognized stock-based compensation expense, weighted-average recognition period				1 year 1 month 6 days
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share unit issued	196,580	114,000	159,000
Performance Based Restricted Stock Units Issued in May 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares, outstanding				47,000
Performance Based Restricted Stock Units Issued in May 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares, outstanding				43,000
Performance Based Restricted Stock Units Issued in May 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares, outstanding				0
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP, exercise price as a percentage of its market price				85.00%