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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($)
$ in Thousands
Nov. 30, 2016
Aug. 31, 2016
Nov. 30, 2015
Aug. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 103,058 $ 101,246 $ 129,260 $ 139,093
Derivative assets 1,669 73 2,155  
Derivative liabilities (252) (595) (342)  
Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 103,058 101,246 129,260  
Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 1,669 73 2,155  
Derivative liabilities (252) (595) (342)  
Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents  
Derivative assets  
Derivative liabilities