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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 12 Months Ended
May. 31, 2015
May. 31, 2014
Loss Contingencies [Line Items]    
Maximum potential repurchase liability $ 60,000,000 $ 63,000,000
Other accrued liabilities 100,000 100,000
Discontinued Operations [Member]    
Loss Contingencies [Line Items]    
Maximum potential repurchase liability 19,000,000 33,000,000
Other accrued liabilities $ 9,000 $ 9,000
Minimum [Member]    
Loss Contingencies [Line Items]    
Period to potentially repurchase units 12 months  
Maximum [Member]    
Loss Contingencies [Line Items]    
Period to potentially repurchase units 24 months