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Long-Term Debt (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 01, 2019 | Jul. 31, 2020 | Mar. 27, 2021 | Mar. 28, 2020 | Dec. 28, 2019 | Mar. 27, 2021 | Mar. 28, 2020 | Jun. 30, 2013 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt extinguishment costs |  |  |  |  |  |  | $ (3,719,209) |  |
Loan redeption period after rdemption notice | 30 days |  |  |  |  |  |  |  |
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 |  |  |  |  |  | Sep. 26, 2026 |  |  |
Other comprehensive expense, net of income taxes |  |  | 6,755,876 | $ (13,926,534) |  | $ 9,519,614 | (11,077,655) |  |
Property and equipment with undepreciated cost pledge as collateral for long term debt |  |  | 295,000,000.0 |  |  | 295,000,000.0 |  |  |
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line |  |  | 170,300,000 |  |  | 170,300,000 |  |  |
Interest Rate Swap Two [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  | $ 144,000,000.0 |  |  | $ 144,000,000.0 |  |  |
Derivative, fixed interest rate |  |  | 2.95% |  |  | 2.95% |  |  |
Interest Rate Swap Two [Member] | One-Month LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument variable interest rate |  |  |  |  |  | 1.50% |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  | $ 39,500,000 |  |  | $ 39,500,000 |  |  |
Derivative, fixed interest rate |  |  | 3.92% |  |  | 3.92% |  |  |
Other comprehensive expense, net of income taxes |  |  | $ 5,100,000 | $ 10,500,000 |  | $ 7,200,000 | 8,400,000 |  |
Unrealized losses on cash flow hedge |  |  |  |  |  | $ (4,000,000.0) | $ (12,800,000) |  |
Interest Rate Swap [Member] | One-Month LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument variable interest rate |  |  |  |  |  | 1.65% |  |  |
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  |  |  |  |  |  | $ 700,000,000.0 |
Debt instrument, redemption price as percentage of principal amount |  |  |  |  | 101.917% |  |  |  |
Maturity period of senior notes |  |  |  |  |  | 2023 |  |  |
Debt instrument stated interest rate |  |  |  |  |  |  |  | 5.75% |
Debt instrument outstanding balance |  |  | 295,000,000.0 |  |  | $ 295,000,000.0 |  |  |
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redeemed on July 9, 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt redemeed amount |  |  |  |  |  | $ 150,000,000 |  |  |
Debt instrument, redemption price as percentage of principal amount |  |  |  |  |  | 100.958% |  |  |
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redeemed on August 27, 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt redemeed amount |  | $ 100,000,000 |  |  |  |  |  |  |
Debt instrument, redemption price as percentage of principal amount |  | 100.958% |  |  |  |  |  |  |
Secured Debt [Member] | Interest Rate Swap Two [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Monthly principal amortization |  |  |  |  |  | $ 650,000 |  |  |
Secured Debt [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt maturity date |  |  |  |  |  | Oct. 01, 2027 |  |  |
Monthly principal amortization |  |  |  |  |  | $ 500,000 |  |  |
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 balance |  |  | 63,500,000 |  |  | $ 63,500,000 |  |  | $ 99,700,000
Credit Line [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  | 175,000,000.0 |  |  | 175,000,000.0 |  |  |
Borrowings outstanding |  |  | 93,100,000 |  |  | 93,100,000 |  |  |
Credit Line [Member] | Unused Letters Of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  | 20,000,000.0 |  |  | 20,000,000.0 |  |  |
Unused letters of credit issued |  |  | $ 400,000 |  |  | $ 400,000 |  |  |
Real Estate Loan (the “Loan”) [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument principal amount | $ 155,000,000 |  |  |  |  |  |  |  |
Debt instrument term | 10 years |  |  |  |  |  |  |  |
Debt instrument, periodic principal payment | $ 650,000 |  |  |  |  |  |  |  |
Debt maturity date |  |  |  |  |  | Jan. 31, 2030 |  |  |
Real Estate Loan (the “Loan”) [Member] | Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt extinguishment costs |  |  |  |  | $ 3,700,000 |  |  |  |

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