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Debt and Lines of Credit - Debt (Details) - USD ($) | Aug. 31, 2020 | Aug. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 401,100,000 | $ 356,600,000
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2021 | 24,300,000 |
2022 | 20,200,000 |
2023 | 355,300,000 |
2024 | 300,000 |
2025 | 300,000 |
After 2024 | 700,000 |
Senior Unsecured Notes | Unsecured public notes due December 2019 |  |
Debt Instrument [Line Items] |  |
Debt outstanding | 0 | 350,000,000.0
Senior unsecured public notes due December 2019, unamortized discount and deferred costs | 0 | (100,000)
Unsecured Term Loan | Borrowings under Term Loan Facility |  |
Debt Instrument [Line Items] |  |
Total debt | 395,000,000.0 | 0
Industrial Revenue Bond | Industrial revenue bond |  |
Debt Instrument [Line Items] |  |
Total debt | 4,000,000.0 | 4,000,000.0
Bank loans | Fixed-rate Bank Loans |  |
Debt Instrument [Line Items] |  |
Total debt | $ 2,100,000 | $ 2,700,000

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