Revenues - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
May 31, 2021 |
May 31, 2020 |
May 31, 2021 |
May 31, 2020 |
Aug. 31, 2020 |
|
| Revenue from Contract with Customer [Abstract] | |||||
| Revenue recognized | $ 34.2 | $ 50.5 | $ 126.2 | $ 182.0 | |
| Contract liabilities | $ 318.8 | $ 318.8 | $ 139.1 | ||