Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	Aug. 31, 2020	Aug. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 121,403	$ 160,787
Marketable securities:
Derivative assets	21	898
Earn-out liability	(1,112)
Derivative liabilities		(12)
Corporate Bonds [Member]
Marketable securities:
Marketable securities	14,426
U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	5,085
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	121,403	160,787
Marketable securities:
Derivative assets	0	0
Earn-out liability	0
Derivative liabilities		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
Marketable securities:
Derivative assets	21	898
Earn-out liability	0
Derivative liabilities		(12)
Level 2 [Member] | Corporate Bonds [Member]
Marketable securities:
Marketable securities	14,426
Level 2 [Member] | U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	5,085
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Marketable securities:
Derivative assets	0	0
Earn-out liability	(1,112)
Derivative liabilities		$ 0
Level 3 [Member] | Corporate Bonds [Member]
Marketable securities:
Marketable securities	0
Level 3 [Member] | U.S. Treasury Securities [Member]
Marketable securities:
Marketable securities	$ 0