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Postretirement and Other Employee Benefits (Additional Information) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |
Company contributions | $ 49.0 | $ 40.5 | $ 33.6
Minimum |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |
Contributions expected to funded pension plans during fiscal year 2018 | 0.4 |  |
Maximum |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |
Contributions expected to funded pension plans during fiscal year 2018 | $ 0.6 |  |
Global equity securities |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |
Target allocation percentage | 35.00% |  |
Debt securities |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |
Target allocation percentage | 65.00% |  |
Foreign Plan |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |
Service period | 3 years |  |

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