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Long-Term Debt (Narrative) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Jun. 30, 2021 | Sep. 30, 2017 | Sep. 28, 2024 | Sep. 30, 2023 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |  |  |  |
Property and equipment with undepreciated cost pledge as collateral for long term debt |  |  |  | $ 249,500,000 |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  | us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember |  |
Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  |  | $ 150,000,000.0 |  |
Borrowings outstanding |  |  |  | $ 0 |  |
Derivative maturity date |  |  |  | Jun. 01, 2026 |  |
Letter of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  |  | $ 10,000,000.0 |  |
Borrowings outstanding |  |  |  | 0 |  |
Cash Flow Hedging [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), net of income taxes |  |  |  | (6,500,000) | $ 800,000 |
Unrealized gains (losses) on cash flow hedge |  |  |  | $ 8,900,000 | $ 17,500,000 |
Interest Rate Swap [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  | 3.962% |  |
Senior Notes, Maturing 2031 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument principal amount |  | $ 350,000,000.0 |  |  |  |
Debt instrument stated interest rate |  | 4.00% |  | 4.00% | 4.00% |
Maturity period of senior notes |  | 2031 |  |  |  |
Senior Notes, Maturing 2031 [Member] | May Redeem Prior to June 15, 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, redemption price as percentage of principal amount |  |  |  | 100.00% |  |
Senior Notes, Maturing 2031 [Member] | May Redeem Prior to June 15, 2024 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, redemption price as percentage of principal amount |  |  |  | 104.00% |  |
Debt instrument redemption percentage |  |  |  | 40.00% |  |
Debt instrument redemption percentage outstanding |  |  |  | 60.00% |  |
Secured Debt Maturing October 2027 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt maturity date |  |  | Oct. 01, 2027 |  |  |
Secured borrowing |  |  | $ 60,000,000 |  |  |
Secured Debt Maturing October 2027 [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative notional amount |  |  |  | $ 18,500,000 |  |
Derivative, fixed interest rate |  |  |  | 3.962% |  |
Derivative basis spread |  |  |  | 1.75% |  |
Monthly principal amortization |  |  |  | $ 500,000 |  |
Derivative maturity date |  |  |  | Oct. 01, 2027 |  |
Secured Debt Maturing January 2030 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument principal amount | $ 155,000,000 |  |  |  |  |
Debt maturity date | Jan. 01, 2030 |  |  |  |  |
Secured Debt Maturing January 2030 [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative notional amount |  |  |  | $ 116,900,000 |  |
Derivative, fixed interest rate |  |  |  | 2.998% |  |
Derivative basis spread |  |  |  | 1.60% |  |
Monthly principal amortization |  |  |  | $ 650,000 |  |
Recovery Zone Facility Bonds [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt maturity date |  |  |  | Jan. 01, 2036 |  |
Annual amount of redemption of bonds |  |  |  | $ 4,500,000 |  |
Mandatory bonds redemption beginning period |  |  |  | Jan. 01, 2014 |  |
Mandatory bonds redemption period end date |  |  |  | Dec. 17, 2029 |  |
Total amount of bonds funded |  |  |  |  |  | $ 99,700,000

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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 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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