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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($)
$ in Thousands
Feb. 29, 2016
Aug. 31, 2015
Feb. 28, 2015
Aug. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 89,522 $ 139,093 $ 167,165 $ 171,842
Derivative assets 14 712 3,411  
Derivative liabilities (826) (413) (393)  
Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 89,522 139,093 167,165  
Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 14 712 3,411  
Derivative liabilities $ (826) $ (413) $ (393)  
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents  
Derivative assets  
Derivative liabilities