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New Accounting Pronouncements - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Feb. 28, 2018	Feb. 28, 2018
ASU No. 2016-09 | U.S.
Increase (decrease) in income tax expense	$ 331,000	$ (3,463,000)

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- Definition

The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

+ References

No definition available.

+ Details

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- Details

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- Details

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