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New Accounting Pronouncements - Additional Information (Detail) - ASU No. 2016-09	3 Months Ended
	Aug. 31, 2017 USD ($) $ / shares
U.S.
Decrease in income tax expense | $	$ (396,000)
Minimum
New Accounting Pronouncement, Effect of Change on Basic Earnings Per Share	$ 0.01
Maximum
New Accounting Pronouncement, Effect of Change on Basic Earnings Per Share	$ 0.03

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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.

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Amount of the effect of a change in accounting principle on basic earnings per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
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-Topic 250
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-Section 50
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