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Long-Term Debt (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Jun. 30, 2021 | Dec. 24, 2022 | Dec. 25, 2021 | Sep. 24, 2022 | Sep. 30, 2017 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |
Other comprehensive income, net of tax |  |  | $ (1,150,507) | $ 1,410,887 |  |  |
Other Assets |  |  | 45,478,485 |  | $ 44,752,886 |  |
Secured borrowing |  |  |  |  |  | $ 60,000,000 |
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 |  |  |  |
Property and equipment with undepreciated cost pledge as collateral for long term debt |  |  | $ 260,000,000.0 |  |  |  |
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line |  |  | 406,100,000 |  |  |  |
Cash Flow Hedging [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Other comprehensive (loss)/ income, net of income taxes |  |  | (1,200,000) | $ 1,400,000 |  |  |
Unrealized gain on cash flow hedge |  |  | (14,900,000) |  |  |  |
Interest Rate Swap at Fixed Rate of 3.92% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Derivative notional amount |  |  | $ 29,000,000.0 |  |  |  |
Derivative, fixed interest rate | 2.95% |  | 3.92% |  |  |  |
Derivative maturity date |  |  | Oct. 01, 2027 |  |  |  |
Monthly principal amortization |  |  | $ 500,000 |  |  |  |
Interest Rate Swap at Fixed Rate of 3.92% [Member] | One-Month LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument variable interest rate |  |  | 1.65% |  |  |  |
Interest Rate Swap at Fixed Rate of 2.95% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Derivative notional amount | $ 130,500,000 |  |  |  |  |  |
Derivative, fixed interest rate | 2.95% |  |  |  |  |  |
Monthly principal amortization | $ 650,000 |  |  |  |  |  |
Interest Rate Swap at Fixed Rate of 2.95% [Member] | One-Month LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument variable interest rate | 1.50% |  |  |  |  |  |
Senior Notes, Interest Rate of 4.00%, Maturing 2031 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument principal amount |  | $ 350,000,000.0 |  |  |  |  |
Maturity period of senior notes |  | 2031 |  |  |  |  |
Debt instrument stated interest rate |  | 4.00% |  |  |  |  |
Line Of Credit Maturing September 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt maturity date |  |  | Jun. 01, 2026 |  |  |  |
Line of credit facility borrowing capacity |  |  | $ 150,000,000.0 |  |  |  |
Facility Bonds Due 2036 [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 |  |  | $ 59,000,000.0 |  |  |  | $ 99,700,000
Credit Line [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings outstanding |  |  | $ 0 |  |  |  |
Credit Line [Member] | Unused Letters Of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  | $ 10,000,000.0 |  |  |  |  |
Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt maturity date | Jan. 01, 2030 |  |  |  |  |  |
Derivative notional amount | $ 155,000,000 |  |  |  |  |  |

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