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Commitments and Contingencies - Amounts of Obligations from Repurchased Units and Incurred Net Losses for Periods (Detail)
$ in Thousands
3 Months Ended
Aug. 31, 2016
USD ($)
Unit
Aug. 31, 2015
USD ($)
Unit
Commitments and Contingencies Disclosure [Abstract]    
Number of units repurchased | Unit 0 0
Obligations from units repurchased $ 0 $ 0
Net losses on repurchased units $ 0 $ 0