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v3.21.2

Fair Value Measurements (Narrative) (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
May 31, 2021 | May 31, 2020
Percentage of marketable securities investments mature within one year | 69.00% |
Percentage of marketable securities investments mature within one to three years | 31.00% |
Fair Value, Measurements, Nonrecurring [Member] |  |
Assets fair value adjustments | $ 0 |
Liabilities fair value adjustments | $ 0 |
Net Irrigate, LLC [Member] |  |
Maximum potential payout |  | $ 1,500,000

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