Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measures (Details)

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Fair Value Measures (Details) - Recurring - USD ($)
$ in Thousands
Feb. 29, 2016
May. 31, 2015
Foreign currency forward contracts | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 0 $ 0
Foreign currency forward contracts | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 1,958 751
Liabilities 3,028 141
Foreign currency forward contracts | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Variable cash settlement | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 0 0
Variable cash settlement | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 476 20
Variable cash settlement | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities $ 0 $ 0