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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Aug. 31, 2015
May. 31, 2015
Loss Contingencies [Line Items]    
Maximum potential repurchase liability $ 55,000,000 $ 60,000,000
Other accrued liabilities 100,000 100,000
Discontinued Operations [Member]    
Loss Contingencies [Line Items]    
Maximum potential repurchase liability 14,000,000 19,000,000
Other accrued liabilities $ 9,000 $ 9,000
Minimum [Member]    
Loss Contingencies [Line Items]    
Period to potentially repurchase units 12 months 12 months
Maximum [Member]    
Loss Contingencies [Line Items]    
Period to potentially repurchase units 24 months 24 months