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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Aug. 31, 2012
Income Taxes (Textual) [Abstract]  
Deferred tax assets $ 39
Federal net operating loss and tax credit carryforwards 25
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