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Long-Term Debt (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Mar. 25, 2023 | Mar. 26, 2022 | Mar. 25, 2023 | Mar. 26, 2022 | Sep. 24, 2022 | Jun. 24, 2021 | May 31, 2021 | Dec. 31, 2019 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  | $ 17,529,304 |  | $ 17,529,304 |  | $ 17,620,789 |  |  |  |
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 |  |  |  |  |  |
Derivative notional amount |  | 128,500,000 |  | $ 128,500,000 |  |  |  |  |  |
Other Long-Term Liabilities |  | 44,361,613 |  | 44,361,613 |  | $ 41,479,220 |  |  |  |
Property and equipment with undepreciated cost pledge as collateral for long term debt |  | 257,600,000 |  | 257,600,000 |  |  |  |  |  |
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line |  | 421,300,000 |  | 421,300,000 |  |  |  |  |  |
Interest Rate Swaps Derivative Contract Asset [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on cash flow hedge |  |  |  | (12,200,000) |  |  |  |  |  |
Other comprehensive income (loss), net of income taxes |  | $ 2,000,000.0 | $ 7,500,000 | $ 3,200,000 | $ 8,900,000 |  |  |  |  |
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity period of senior notes |  |  |  | 2031 |  |  |  |  |  |
Senior Notes, Interest Rate of 4.00%, Maturing 2031 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  |  |  |  |  | $ 350,000,000.0 |  |  |
Debt instrument stated interest rate |  | 4.00% |  | 4.00% |  |  |  |  |  |
Secured Debt Maturing January 2030 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  |  |  |  |  |  |  | $ 155,000,000 |
Derivative, fixed interest rate |  | 2.95% |  | 2.95% |  |  |  |  |  |
Debt instrument variable interest rate |  |  |  | 1.50% |  |  |  |  |  |
Monthly principal amortization |  |  |  | $ 650,000 |  |  |  |  |  |
Secured Debt Maturing 2037 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt maturity date | Oct. 01, 2027 |  |  |  |  |  |  |  |  |
Secured borrowing | $ 60,000,000 |  |  |  |  |  |  |  |  |
Derivative notional amount |  | $ 27,500,000 |  | $ 27,500,000 |  |  |  |  |  |
Derivative, fixed interest rate |  | 3.92% |  | 3.92% |  |  |  |  |  |
Derivative maturity date |  |  |  | Oct. 01, 2027 |  |  |  |  |  |
Monthly principal amortization |  |  |  | $ 500,000 |  |  |  |  |  |
Secured Debt Maturing 2037 [Member] | One-Month LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument variable interest rate |  |  |  | 1.65% |  |  |  |  |  |
Line of credit Maturing September 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  |  |  |  |  |  | $ 150,000,000.0 |  |
Facility Bonds [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt maturity date |  |  |  | Jan. 01, 2036 |  |  |  |  |  |
Description of interest rate on bonds |  |  |  | . The interest rate on the Bonds is equal to one-month LIBOR (adjusted monthly) plus a credit spread, adjusted to reflect the income tax exemption |  |  |  |  |  |
Debt instrument outstanding amount |  | $ 54,400,000 |  | $ 54,400,000 |  |  |  |  |  | $ 99,700,000
Credit Line [Member] | Unused Letters Of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  | $ 10,000,000.0 |  | $ 10,000,000.0 |  |  |  |  |  |

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