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Long-Term Debt (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2017 | Mar. 30, 2024 | Mar. 25, 2023 | Mar. 30, 2024 | Mar. 25, 2023 | Jun. 26, 2021 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Property and equipment with undepreciated cost pledge as collateral for long term debt |  |  | $ 252,200,000 |  | $ 252,200,000 |  |  |
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line |  |  | 498,500,000 |  | 498,500,000 |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  | $ 150,000,000.0 |  | 150,000,000.0 |  |  |
Debt maturity date |  |  | Jun. 30, 2026 |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  | $ 10,000,000.0 |  | 10,000,000.0 |  |  |
Cash Flow Hedging [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Other comprehensive loss, net of income taxes |  |  | $ 1,100,000 | $ 2,000,000.0 | 2,700,000 | $ 3,200,000 |  |
Unrealized gains (losses) on cash flow hedge |  |  |  |  | $ 14,000,000.0 | $ 12,200,000 |  |
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% |  |  |
Maturity period of senior notes |  |  |  |  | 2031 |  |  |
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 |  |  | $ 21,500,000 |  | $ 21,500,000 |  |  |
Derivative, fixed interest rate |  |  | 3.962% |  | 3.962% |  |  |
Monthly principal amortization |  |  |  |  | $ 500,000 |  |  |
Derivative maturity date |  |  |  |  | Oct. 01, 2027 |  |  |
Secured Debt Maturing October 2027 [Member] | Interest Rate Swap [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument variable interest rate |  |  |  |  | 1.75% |  |  |
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 | $ 120,800,000 |  |  |  |  |  |  |
Derivative, fixed interest rate | 2.998% |  | 2.998% |  | 2.998% |  |  |
Monthly principal amortization | $ 650,000 |  |  |  |  |  |  |
Secured Debt Maturing January 2030 [Member] | Interest Rate Swap [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument variable interest rate | 1.60% |  |  |  |  |  |  |
Recovery Zone Facility Bonds [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturity date |  |  |  |  | Jan. 01, 2036 |  |  |
Annual amount of redemption of bonds |  |  | $ 4,500,000 |  | $ 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 |  |  | $ 49,900,000 |  | $ 49,900,000 |  |  | $ 99,700,000

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