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Debt and Lines of Credit (Details) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 10, 2020 USD ($) | Jun. 29, 2018 USD ($) | Feb. 28, 2021 USD ($) | Nov. 30, 2020 USD ($) | Feb. 29, 2020 USD ($) | Feb. 28, 2021 USD ($) | Feb. 29, 2020 USD ($) | Aug. 31, 2020 USD ($)
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  |  | $ 397,100,000 | $ 350,500,000 |
Interest Revenue (Expense), Net [Abstract] |  |  |  |  |  |  |  |
Interest expense |  |  | $ 6,900,000 |  | $ 6,800,000 | 12,000,000.0 | 15,800,000 |
Interest income |  |  | (300,000) |  | (1,100,000) | (500,000) | (1,800,000) |
Interest expense, net |  |  | 6,600,000 |  | $ 5,700,000 | 11,500,000 | $ 14,000,000.0 |
Unsecured debt | Unsecured Delayed Draw Term Loan |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 400,000,000.0 |  |  |  |  |  |
Debt repaid |  |  |  | $ 395,000,000.0 |  |  |  |
Borrowings outstanding under current Revolving Credit Facility |  |  |  |  |  |  |  | $ 395,000,000.0
Industrial revenue bond | Industrial Revenue Bond Maturing in 2021 |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Debt outstanding |  |  | 4,000,000.0 |  |  | 4,000,000.0 |  |
Bank loans | Bank loans |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  | 2,100,000
Debt repaid |  |  |  |  |  | 2,100,000 |  |
Credit facility |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Minimum interest coverage ratio |  | 2.50 |  |  |  |  |  |
Maximum leverage ratio |  | 3.50 |  |  |  |  |  |
Outstanding letters of credit |  |  | 8,400,000 |  |  | 8,400,000 |  |
Credit facility | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Facility fee (percent) |  | 0.125% |  |  |  |  |  |
Credit facility | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Facility fee (percent) |  | 0.25% |  |  |  |  |  |
Credit facility | New Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Term of instrument |  | 5 years |  |  |  |  |  |
Executed revolving credit facility |  | $ 400,000,000.0 |  |  |  |  |  |
Borrowings outstanding under current Revolving Credit Facility |  |  | 0 |  |  | 0 |  | $ 0
Additional borrowing capacity under revolving credit facility |  |  | 395,800,000 |  |  | 395,800,000 |  |
Letters of Credit | New Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  | 4,200,000 |  |  | 4,200,000 |  |
Eurocurrency Rate | Credit facility | New Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Applicable margins based on company's leverage ratio, percentage |  | 1.00% |  |  |  |  |  |
Eurocurrency Rate | Credit facility | New Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Applicable margins based on company's leverage ratio, percentage |  | 1.375% |  |  |  |  |  |
Base rate | Credit facility | New Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Applicable margins based on company's leverage ratio, percentage |  | 0.00% |  |  |  |  |  |
Base rate | Credit facility | New Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Applicable margins based on company's leverage ratio, percentage |  | 0.375% |  |  |  |  |  |
ABL | Unsecured debt | 2.150% Senior Unsecured Notes Due December 2030 |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Aggregate principal amount | $ 500,000,000.0 |  |  |  |  |  |  |
Interest rate (percent) | 2.15% |  |  |  |  |  |  |
Debt issuance price as a percentage of face value (percent) | 99.737% |  |  |  |  |  |  |
Deferred issuance costs | $ 4,800,000 |  |  |  |  |  |  |
Term of instrument | 10 years |  |  |  |  |  |  |
Debt outstanding |  |  | $ 494,000,000.0 |  |  | $ 494,000,000.0 |  |

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 Reference 2: 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 3: 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(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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