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Commitments and Contingencies - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
May 31, 2016
Loss Contingencies [Line Items]          
Maximum potential repurchase liability $ 25,000,000   $ 25,000,000   $ 25,000,000
Other accrued liabilities 100,000   100,000   $ 100,000
Obligations from units repurchased $ 0 $ 0 $ 0 $ 0  
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