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Long-Term Debt (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Mar. 26, 2022 | Mar. 27, 2021 | Mar. 26, 2022 | Mar. 27, 2021 | Sep. 25, 2021 | Jun. 30, 2021 | Jun. 26, 2021 | May 31, 2021 | Dec. 31, 2019 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
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 |  | 136,300,000 |  | $ 136,300,000 |  |  |  |  |  |  |
Other comprehensive income, net of income taxes |  | 9,896,413 | $ 6,755,876 | 11,763,300 | $ 9,519,614 |  |  |  |  |  |
Other long-term liabilities |  | 45,078,425 | 4,000,000.0 | 45,078,425 | 4,000,000.0 | $ 50,418,947 |  |  |  |  |
Property and equipment with undepreciated cost pledge as collateral for long term debt |  | 274,400,000 |  | 274,400,000 |  |  |  |  |  |  |
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line |  | 305,900,000 |  | 305,900,000 |  |  |  |  |  |  |
Cash Flow Hedging [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income, net of income taxes |  |  | $ 5,100,000 |  | $ 7,200,000 |  |  |  |  |  |
Interest Rate Swap at Fixed Rate of 3.92% [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized gain on cash flow hedge |  |  |  | (7,200,000) |  |  |  |  |  |  |
Other comprehensive expense, net of income taxes |  | $ 7,500,000 |  | $ 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 |  | $ 33,500,000 |  | $ 33,500,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 175,000,000.0 |  |
Recovery Zone 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 |  | $ 59,000,000.0 |  | $ 59,000,000.0 |  |  |  |  |  |  | $ 99,700,000
Credit Line [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  |  |  |  |  | $ 150.0 |  |  |  |
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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