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Summary of Significant Accounting Policies and Practices - Acquisition of Non-Controlling Interest (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Noncontrolling Interest [Line Items]
Carrying value of non-controlling interest at May 31, 2015	$ 6,034
Income attributable to non-controlling interest	0
Other comprehensive income attributable to non-controlling interest	0	$ 6
Purchase of non-controlling interest	$ (6,034)

X

- Definition

Amount of Income (Loss) attributable to the noncontrolling interest.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.19)



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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



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-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.31)



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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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-Name Accounting Standards Codification



-Topic 505



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Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests.

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