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Equity Compensation Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	3,501,000	3,997,000	1,913,000
Options Exercisable, Weighted Average Exercise Price	$ 48.94	$ 40.68
Compensation expense related to share based awards	$ 6,468,000	$ 5,543,000	$ 4,909,000
Remaining compensation cost to be expensed in future periods for non-vested options	$ 16,949,000
Weighted average expense recognition period	3 years 2 months 12 days
Number of shares purchased by employees	21,578	18,330	22,127
Employee Stock Purchase Plan | 2011 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	343,817
Number of shares authorized for grant	712,500
Annual maximum limit percentage of compensation to purchase shares	5.00%
Employee stock purchase plan stock price percentage	10.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period	3 years
Stock option contractual terms	5 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period	5 years
Stock option contractual terms	10 years

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