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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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