Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
May 31, 2021	May 31, 2020	May 31, 2019
Stock Options
Outstanding, beginning of year	1,352	1,555	2,019
Granted	116	101	96
Exercised	(854)	(303)	(506)
Forfeited	(12)	(1)	(54)
Outstanding, end of year	602	1,352	1,555
Exercisable at end of year	389	1,167	1,397
Weighted Average Exercise Price
Outstanding, beginning of year	$ 27.34	$ 24.01	$ 22.26
Granted	36.93	38.91	42.86
Exercised	22.16	13.99	18.45
Forfeited	31.52	43.04	44.31
Outstanding, end of year	36.44	27.34	24.01
Exercisable at end of year	$ 35.55	$ 25.34	$ 21.96
Weighted Average Remaining Contractual Life (in years)
Outstanding	5 years 7 months 9 days	3 years 2 months 15 days	3 years 1 month 24 days
Exercisable	4 years 1 month 24 days	2 years 5 months 8 days	2 years 7 months 13 days
Aggregate intrinsic value
Outstanding	$ 18,037	$ 8,846	$ 18,728
Exercisable	$ 12,415	$ 8,846	$ 18,728

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Period Type:	instant

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.