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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