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Commitments and Contingencies (Tables)
 12 Months Ended
May. 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:

 

     Year ended May 31,  
     2015      2014  
     (Dollars in thousands)  

Number of units repurchased

      42         —   

Obligations from units repurchased

    $ 689       $ —   

Net losses on repurchased units

    $ 177       $ —