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Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
May 31, 2019 | Aug. 31, 2018
Disaggregation Of Revenue [Line Items] |  |
Unsatisfied performance obligation amount | $ 1.6 |
Contract assets |  | $ 0.5
Revenue recognized | 0.8 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | ASC Topic 606 [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Contract assets | 1.1 |
Other Current Assets [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Contract assets | 1.4 |
Other Current Liabilities [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Contract liabilities | $ 13.1 | $ 8.2

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