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v3.20.2

Fair Value Measurements (Narrative) (Details) - USD ($) | 9 Months Ended
--- | ---
May 31, 2020 | May 31, 2019
Percentage of marketable securities investments mature within one year | 67.00% |
Percentage of marketable securities investments mature within one to three years | 33.00% |
Fair Value, Measurements, Nonrecurring [Member] |  |
Assets fair value adjustments | $ 0 | $ 0
Liabilities fair value adjustments | $ 0 | $ 0

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