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Fair Value Measurements (Narrative) (Details) - USD ($) | 3 Months Ended
--- | ---
Nov. 30, 2020 | May 31, 2020 | Nov. 30, 2019
Percentage of marketable securities investments mature within one year | 72.00% |  |
Percentage of marketable securities investments mature within one to three years | 28.00% |  |
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Assets fair value adjustments | $ 0 |  | $ 0
Liabilities fair value adjustments | $ 0 |  | $ 0
Net Irrigate, LLC [Member] |  |  |
Earn-out liability payment period |  | 1 year |
Maximum potential payout |  | $ 1,500,000 |

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