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Commitments and Contingencies (Tables)
 12 Months Ended
May 31, 2017
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,  
     2017      2016  
     (Dollars in thousands)  

Number of units repurchased

      —        6  

Obligations from units repurchased

    $ —      $ 115  

Net losses on repurchased units

    $ —      $ 50