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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($)
$ in Thousands
Nov. 30, 2018
Aug. 31, 2018
Nov. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents $ 137,217 $ 160,787 $ 109,450
Derivative assets 924 898 34
Derivative liabilities (293) (12) (485)
Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 137,217 160,787 109,450
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 924 898 34
Derivative liabilities (293) (12) (485)
Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents
Derivative assets
Derivative liabilities