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Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Nov. 30, 2020
Aug. 31, 2020
Nov. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents $ 126,802 $ 121,403 $ 120,910
Marketable securities:      
Derivative assets   21 13
Derivative liabilities     (115)
Earn-out liability (1,112) (1,112)  
Corporate Bonds [Member]      
Marketable securities:      
Marketable securities 14,564 14,426  
U.S. Treasury Securities [Member]      
Marketable securities:      
Marketable securities 5,060 5,085  
Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 126,802 121,403 120,910
Marketable securities:      
Derivative assets   0 0
Derivative liabilities     0
Earn-out liability 0 0  
Level 1 [Member] | Corporate Bonds [Member]      
Marketable securities:      
Marketable securities 0 0  
Level 1 [Member] | U.S. Treasury Securities [Member]      
Marketable securities:      
Marketable securities 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
Marketable securities:      
Derivative assets   21 13
Derivative liabilities     (115)
Earn-out liability 0 0  
Level 2 [Member] | Corporate Bonds [Member]      
Marketable securities:      
Marketable securities 14,564 14,426  
Level 2 [Member] | U.S. Treasury Securities [Member]      
Marketable securities:      
Marketable securities 5,060 5,085  
Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 0 0 0
Marketable securities:      
Derivative assets   0 0
Derivative liabilities     $ 0
Earn-out liability (1,112) (1,112)  
Level 3 [Member] | Corporate Bonds [Member]      
Marketable securities:      
Marketable securities 0 0  
Level 3 [Member] | U.S. Treasury Securities [Member]      
Marketable securities:      
Marketable securities $ 0 $ 0