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Stock Repurchase - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016	Dec. 31, 2008
Stock Repurchase Program [Line Items]
Shares authorized to purchase				1,500,000
Cumulative number of shares repurchased	149,368
Cost of repurchased shares, including commissions	$ 923
Number of shares repurchased	0	0	0

X

- Definition

Cumulative stock repurchased and retired shares.

+ References

No definition available.

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- Definition

Cumulative stock repurchased and retired value.

+ References

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- Definition

Stock repurchase program.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 210
-SubTopic 10
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