Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	Feb. 28, 2022	Aug. 31, 2021	Feb. 28, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 68,951	$ 127,107	$ 110,775
Marketable securities:
Earn-out liability		(250)	(1,098)
Corporate Bonds [Member]
Marketable securities:
Marketable securities	20,322	15,484	15,501
U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	4,612	4,120	4,054
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	68,951	127,107	110,775
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	20,322	15,484	15,501
Level 2 [Member] | U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	4,612	4,120	4,054
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)	(1,098)
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