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Fair Value Measurements - Schedule of Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Nov. 30, 2016
May 31, 2016
Fair value on a recurring basis    
Marketable securities $ 0 $ 70,405
Fair Value, Measurements, Recurring    
Fair value on a recurring basis    
Cash and cash equivalents 143,573 139,357
Interest rate lock agreements 3,264  
Total assets at fair value 146,837 209,762
Total liabilities at fair value   19,628
Fair Value, Measurements, Recurring | Interest rate lock agreement    
Fair value on a recurring basis    
Long term accrued liabilities   19,628
Fair Value, Measurements, Recurring | Canadian treasury securities    
Fair value on a recurring basis    
Marketable securities   70,405
Fair Value, Measurements, Recurring | Level 1    
Fair value on a recurring basis    
Cash and cash equivalents 143,573 139,357
Interest rate lock agreements 0  
Total assets at fair value 143,573 139,357
Total liabilities at fair value   0
Fair Value, Measurements, Recurring | Level 1 | Interest rate lock agreement    
Fair value on a recurring basis    
Long term accrued liabilities   0
Fair Value, Measurements, Recurring | Level 1 | Canadian treasury securities    
Fair value on a recurring basis    
Marketable securities   0
Fair Value, Measurements, Recurring | Level 2    
Fair value on a recurring basis    
Cash and cash equivalents 0 0
Interest rate lock agreements 3,264  
Total assets at fair value 3,264 70,405
Total liabilities at fair value   19,628
Fair Value, Measurements, Recurring | Level 2 | Interest rate lock agreement    
Fair value on a recurring basis    
Long term accrued liabilities   19,628
Fair Value, Measurements, Recurring | Level 2 | Canadian treasury securities    
Fair value on a recurring basis    
Marketable securities   70,405
Fair Value, Measurements, Recurring | Level 3    
Fair value on a recurring basis    
Cash and cash equivalents 0 0
Interest rate lock agreements 0  
Total assets at fair value $ 0 0
Total liabilities at fair value   0
Fair Value, Measurements, Recurring | Level 3 | Interest rate lock agreement    
Fair value on a recurring basis    
Long term accrued liabilities   0
Fair Value, Measurements, Recurring | Level 3 | Canadian treasury securities    
Fair value on a recurring basis    
Marketable securities   $ 0