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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($)
$ in Thousands
Feb. 28, 2017
Aug. 31, 2016
Feb. 29, 2016
Aug. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 102,825 $ 101,246 $ 89,522 $ 139,093
Derivative assets   73 14  
Derivative liabilities (868) (595) (826)  
Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 102,825 101,246 89,522  
Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets   73 14  
Derivative liabilities (868) (595) (826)  
Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents  
Derivative assets  
Derivative liabilities