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Fair Value Measurements (Narrative) (Details) - USD ($) | 3 Months Ended
--- | ---
Nov. 30, 2021 | Nov. 30, 2020
Percentage of marketable securities investments mature within one year | 65.00% |
Percentage of marketable securities investments mature within one to five years | 35.00% |
Fair Value, Measurements, Nonrecurring [Member] |  |
Assets fair value adjustments | $ 0 | $ 0
Liabilities fair value adjustments | $ 0 | $ 0

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