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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Feb. 28, 2013
Income Taxes (Textual) [Abstract]
Deferred tax assets	$ 41
Federal net operating loss and tax credit carryforwards	27
State net operating loss carryforwards	7
Differences between financial and tax reporting	$ 7
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 Statement of Financial Accounting Standard (FAS)

-Number 109

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