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Repurchase of Common Stock - Additional Information (Detail) - USD ($)	3 Months Ended
	Aug. 31, 2015	Jun. 23, 2014
Equity, Class of Treasury Stock [Line Items]
Stock repurchased and retired during period, shares	0
Remaining stock available to repurchase	$ 15,500,000
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount		$ 50,000,000
Stock repurchases leverage ratio	250.00%

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+ References

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- Definition

Amount of stock repurchase plan authorized.

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 04



-Article 3



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 29, 30



-Article 5

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