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Commitments and Contingencies (Tables)
 3 Months Ended
Aug. 31, 2015
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 presented are as follows:

 

     Three-Months Ended
August 31,		  
     2015      2014  
     (Unaudited)  
     (Dollars in thousands)  

Number of units repurchased

      —           11   

Obligations from units repurchased

    $ —         $ 203   

Net losses on repurchased units

    $ —         $ 43