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Equity Compensation Plans - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018	May 31, 2019	May 31, 2018
Compensation expense related to share based awards	$ 1,306,000	$ 1,026,000	$ 4,137,000	$ 3,692,000
Weighted-average fair value per share of stock options granted						$ 14.91
During Fiscal 2019
Weighted-average fair value per share of stock options granted					$ 14.44
Employee Stock Purchase Plan | 2011 Employee Stock Purchase Plan
Annual maximum limit percentage of compensation to purchase shares			5.00%
Minimum
Stock option vesting period			3 years
Stock option contractual terms			5 years
Maximum
Stock option vesting period			5 years
Stock option contractual terms			10 years

X

- Definition

Share based compensation arrangement by share based payment award, options, contractual term one.

+ References

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Discount rate from fair value on purchase date that participants pay for shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

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