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Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Feb. 28, 2021
Aug. 31, 2020
Feb. 29, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents $ 110,775 $ 121,403 $ 101,272
Marketable securities:      
Derivative assets   21 247
Earn-out liability (1,098) (1,112)  
Corporate Bonds [Member]      
Marketable securities:      
Marketable securities 15,501 14,426 14,555
U.S. Treasury Securities [Member]      
Marketable securities:      
Marketable securities 4,054 5,085 4,185
Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 110,775 121,403 101,272
Marketable securities:      
Derivative assets   0 0
Earn-out liability 0 0  
Level 1 [Member] | Corporate Bonds [Member]      
Marketable securities:      
Marketable securities 0 0 0
Level 1 [Member] | U.S. Treasury Securities [Member]      
Marketable securities:      
Marketable securities 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
Marketable securities:      
Derivative assets   21 247
Earn-out liability 0 0  
Level 2 [Member] | Corporate Bonds [Member]      
Marketable securities:      
Marketable securities 15,501 14,426 14,555
Level 2 [Member] | U.S. Treasury Securities [Member]      
Marketable securities:      
Marketable securities 4,054 5,085 4,185
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
Earn-out liability (1,098) (1,112)  
Level 3 [Member] | Corporate Bonds [Member]      
Marketable securities:      
Marketable securities 0 0 0
Level 3 [Member] | U.S. Treasury Securities [Member]      
Marketable securities:      
Marketable securities $ 0 $ 0 $ 0