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Commitments and Contingencies (Tables)
 9 Months Ended
Feb. 29, 2016
Commitments and Contingencies Disclosure [Abstract]  
Amounts of Obligations from Repurchased Units, Discontinued Operations and Incurred Net Losses for Periods

The amounts of obligations from repurchased units, all of which were from discontinued operations, and incurred net losses for the periods reported are as follows:

 

     Nine-Months Ended  
     February 29,      February 28,  
     2016      2015  
     (Unaudited)  
     (Dollars in thousands)  

Number of units repurchased

      —           11   

Obligations from units repurchased

    $ —         $ 203   

Net losses on repurchased units

    $ —         $ 43