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Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	May 31, 2021	Aug. 31, 2020	May 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 120,801	$ 121,403	$ 102,474
Marketable securities:
Derivative assets		21	909
Derivative liabilities			(528)
Earn-out liability	(1,098)	(1,112)	(1,195)
Corporate Bonds [Member]
Marketable securities:
Marketable securities	15,114	14,426	14,554
U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	4,549	5,085	4,458
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	120,801	121,403	102,474
Marketable securities:
Derivative assets		0	0
Derivative liabilities			0
Earn-out liability	0	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	909
Derivative liabilities			(528)
Earn-out liability	0	0	0
Level 2 [Member] | Corporate Bonds [Member]
Marketable securities:
Marketable securities	15,114	14,426	14,554
Level 2 [Member] | U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	4,549	5,085	4,458
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	(1,098)	(1,112)	(1,195)
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

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