Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	Nov. 30, 2021	Aug. 31, 2021	Nov. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 84,719	$ 127,107	$ 126,802
Marketable securities:
Earn-out liability		(250)	(1,112)
Corporate Bonds [Member]
Marketable securities:
Marketable securities	26,503	15,484	14,564
U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	3,692	4,120	5,060
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	84,719	127,107	126,802
Marketable securities:
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:
Earn-out liability		0	0
Level 2 [Member] | Corporate Bonds [Member]
Marketable securities:
Marketable securities	26,503	15,484	14,564
Level 2 [Member] | U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	3,692	4,120	5,060
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:
Earn-out liability		(250)	(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