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Long-Term Debt (Tables)
12 Months Ended
May 31, 2016
Debt Disclosure [Abstract]  
Future minimum principal payments on long-term debt
As of May 31, 2016, future minimum principal payments on long-term debt were as follows (in thousands):
 
2017
$
16,250

2018
26,250

2019
78,910

 
$
121,410