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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($)
$ in Thousands
Feb. 28, 2018
Aug. 31, 2017
Feb. 28, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents $ 102,211 $ 121,620 $ 102,825
Derivative assets 19 9
Derivative liabilities (1,010) (1,747) (868)
Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 102,211 121,620 102,825
Derivative assets
Derivative liabilities
Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents
Derivative assets 19 9
Derivative liabilities (1,010) (1,747) (868)
Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents
Derivative assets
Derivative liabilities