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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Nov. 30, 2014
Income Tax Contingency [Line Items]  
Deferred tax assets 49us-gaap_DeferredTaxAssetsGross
Federal net operating loss and tax credit carryforwards 34us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
State net operating loss carryforwards 8us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Differences between financial and tax reporting 7us-gaap_DeferredTaxAssetsNet
Deferred tax assets pertain to discontinued operations 5us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssets
Minimum [Member] | Federal [Member]  
Income Tax Contingency [Line Items]  
Federal net operating loss and tax credit carryforwards life expectancy, maximum 16 years
Minimum [Member] | State [Member]  
Income Tax Contingency [Line Items]  
Federal net operating loss and tax credit carryforwards life expectancy, maximum 5 years
Maximum [Member] | Federal [Member]  
Income Tax Contingency [Line Items]  
Federal net operating loss and tax credit carryforwards life expectancy, maximum 20 years
Maximum [Member] | State [Member]  
Income Tax Contingency [Line Items]  
Federal net operating loss and tax credit carryforwards life expectancy, maximum 20 years