Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	May 31, 2020	Aug. 31, 2019	May 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 102,474	$ 127,204	$ 110,839
Marketable securities:
Derivative assets	909	1,112	534
Derivative liabilities	(528)		(22)
Earn-out liability	1,195
Corporate Bonds [Member]
Marketable securities:
Marketable securities	14,554
U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	4,458
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	102,474	127,204	110,839
Marketable securities:
Derivative assets	0	0	0
Derivative liabilities	0		0
Earn-out liability	0
Level 1 [Member] | Corporate Bonds [Member]
Marketable securities:
Marketable securities	0
Level 1 [Member] | U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	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	909	1,112	534
Derivative liabilities	(528)		(22)
Earn-out liability	0
Level 2 [Member] | Corporate Bonds [Member]
Marketable securities:
Marketable securities	14,554
Level 2 [Member] | U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	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	0
Derivative liabilities	0		$ 0
Earn-out liability	1,195
Level 3 [Member] | Corporate Bonds [Member]
Marketable securities:
Marketable securities	0
Level 3 [Member] | U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	$ 0