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Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Nov. 30, 2019
Aug. 31, 2019
Nov. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents $ 120,910 $ 127,204 $ 137,217
Derivative assets 13 1,112 924
Derivative liabilities (115) 0 (293)
Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 120,910 127,204 137,217
Derivative assets 0 0 0
Derivative liabilities 0 0 0
Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 0 0 0
Derivative assets 13 1,112 924
Derivative liabilities (115) 0 (293)
Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 0 0 0
Derivative assets 0 0 0
Derivative liabilities $ 0 $ 0 $ 0