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Debt and Lines of Credit - Long-term Debt (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 16, 2019 | Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  | $ 350.7 | $ 0.4 | $ 0.4
Total debt outstanding |  | 401.1 | 356.6 |
Senior Unsecured Notes | Unsecured public notes due December 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt | $ 350.0 |  |  |
Industrial Revenue Bond | Industrial revenue bond |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt outstanding |  | $ 4.0 | $ 4.0 |
Long-term debt interest rate (percent) |  | 1.00% | 1.70% |
Bank loans | Fixed-rate Bank Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt outstanding |  | $ 2.1 | $ 2.7 |
Bank loans | Fixed-rate Bank Loans | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (percent) |  | 0.80% |  |
Bank loans | Fixed-rate Bank Loans | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (percent) |  | 2.00% |  |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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