The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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Amount of an unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward. This amount is presented as a reduction of the related deferred tax asset in the balance sheet if that deferred tax asset is not used. This amount is presented separately from the deferred tax asset for a net operating loss carryforward if this unrelated tax benefit is associated with a different tax position.

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- Definition

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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Income Taxes - Additional Information (Details) (USD $)	12 Months Ended
Income Taxes - Additional Information (Details) (USD $)	May 31, 2013	May 31, 2012	May 31, 2011
Income Tax Contingency [Line Items]
Income tax payments	$ 500,000	$ 400,000	$ 400,000
Income tax refunds received	300,000	100,000	13,100,000
Alternative minimum tax credit carryforward	28,808,000	28,808,000
Valuation allowances	3,600,000
Tax credit carryforward - Alternative Minimum Tax
Income Tax Contingency [Line Items]
Alternative minimum tax credit carryforward	28,800,000
Federal
Income Tax Contingency [Line Items]
Federal net operating loss carryforward	143,100,000
State and Local
Income Tax Contingency [Line Items]
State net operating loss carryforwards	$ 5,000,000
NOL carryforward period - minimum	5
NOL carryforward period - maximum	20