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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2015	Aug. 31, 2014	Nov. 30, 2015
Income Tax Examination [Line Items]
Estimated federal statutory income tax rate	50.40%	40.90%
Federal statutory income tax rate			35.00%
Loss carryforwards from acquisitions	$ 148.3		$ 148.3
Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Net deferred tax asset	19.8		19.8
Operating Loss Carryforwards, Valuation Allowance	$ 15.3		$ 15.3

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Effective Income Tax Rate Reconciliation Before Discreet Items, Percent

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Operating Loss Carryforwards, Business Combination

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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