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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Nov. 30, 2013
Income Tax Disclosure [Abstract]
Deferred tax assets	$ 43
Federal net operating loss and tax credit carryforwards	29
State net operating loss carryforwards	8
Differences between financial and tax reporting	$ 6
Federal net operating loss and tax credit carryforwards life expectancy	20 years
State net operating loss carryforwards life expectancy, minimum	5 years
State net operating loss carryforwards life expectancy, maximum	20 years

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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-Publisher FASB

-Name Accounting Standards Codification

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