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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Right of return assets | $ 10.3 | $ 13.9 |
Revenues recognized from beginning balances of contract liabilities | 4.7 |  |
Customers with Rights of Return, Cash Discounts and Other Credits |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Refund liabilities | 31.0 | 37.3 |
Customers with Rebate, Marketing, and Trade Promotion Programs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Refund liabilities | $ 27.7 | $ 34.5 |
Revenue source | Net sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Portion of revenues (percent) | 5.00% | 5.00% | 5.00%
Short-term Contract with Customer | Revenue source | Net sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Portion of revenues (percent) | 95.00% | 95.00% | 95.00%

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