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Significant Accounting Policies - Other Long-Term Assets (Details) $ in Millions | Aug. 31, 2024 USD ($) employee | Aug. 31, 2023 USD ($)
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Other Long-Term Assets [Abstract] |  |
Deferred costs and other assets | $ 12.1 | $ 29.9
Investments in debt and equity securities | 6.7 | 7.2
Pensions plans in which plan assets exceed benefit obligation | 13.3 | 12.4
Total other long-term assets | $ 32.1 | $ 49.5
Number of former employees covered under life insurance policy | employee | 52 |

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