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Commitments and Contingencies - Amounts of Obligations from Repurchased Units, Discontinued Operations and Incurred Net Losses for Periods (Detail)
$ in Thousands
12 Months Ended
May 31, 2016
USD ($)
Unit
Commitments and Contingencies Disclosure [Abstract]  
Number of units repurchased | Unit 6
Obligations from units repurchased $ 115
Net losses on repurchased units $ 50