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Significant Accounting Policies - Other Long-Term Assets and Liabilities (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2019 USD ($) Employee | Sep. 01, 2018 USD ($) | Aug. 31, 2018 USD ($)
Other Long-Term Assets [Abstract] |  |  |
Deferred contract costs | $ 15.4 |  | $ 12.8
Net overfunded pension plans | 0.0 |  | 1.6
Other | 2.3 |  | 4.4
Total other long-term assets | $ 17.7 |  | 18.8
Number of former employees covered under life insurance policy | Employee | 66 |  |
Other Long-Term Liabilities [Abstract] |  |  |
Deferred compensation and postretirement benefits other than pensions | $ 41.6 |  | 40.0
Service-type warranties | 46.4 | $ 35.0 |
Uncertain tax positions liability, including interest | 17.6 |  | 4.9
Other | 5.2 |  | 8.2
Total other long-term liabilities | $ 110.7 |  | 67.9
Percentage contribution rate of eligible employee's compensation | 3.00% |  |
Service-Type Warranties |  |  |
Other Long-Term Liabilities [Abstract] |  |  |
Service-type warranties | $ 46.3 |  |
Service-type warranties |  |  | $ 14.8

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