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Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 16, 2021
Nov. 01, 2019
Jul. 31, 2020
Jun. 26, 2021
Jun. 27, 2020
Dec. 28, 2019
Jun. 26, 2021
Jun. 27, 2020
Jun. 01, 2021
Sep. 26, 2020
Dec. 31, 2010
Debt Instrument [Line Items]                      
Debt extinguishment costs       $ (1,082,633)     $ (1,082,633) $ (3,719,209)      
Current portion of long-term debt       314,533,835     314,533,835     $ 19,305,976  
Proceeds invested in short term investments pending redemption of the 2023 Notes       295,000,000     295,000,000        
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        
Property and equipment with undepreciated cost pledge as collateral for long term debt       298,500,000     $ 298,500,000        
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line       202,600,000     202,600,000        
Interest Rate Swap Two [Member]                      
Debt Instrument [Line Items]                      
Derivative notional amount       $ 142,100,000     $ 142,100,000        
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       $ 38,000,000.0     $ 38,000,000.0        
Derivative, fixed interest rate       3.92%     3.92%        
Other comprehensive income (expense), net of income taxes       $ (700,000) $ (1,200,000)   $ 6,500,000 (9,500,000)      
Unrealized losses on cash flow hedge             $ (4,900,000) $ (14,300,000)      
Interest Rate Swap [Member] | One-Month LIBOR [Member]                      
Debt Instrument [Line Items]                      
Debt instrument variable interest rate             1.65%        
Senior Notes, Interest Rate of 4.000%, Maturing 2031 [Member]                      
Debt Instrument [Line Items]                      
Debt instrument principal amount                 $ 350,000,000.0    
Proceeds invested in short term investments pending redemption of the 2023 Notes                 $ 295,000,000.0    
Debt instrument stated interest rate                 4.00%    
Debt instrument outstanding balance       350,000,000.0     $ 350,000,000.0        
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, redemption price as percentage of principal amount           101.917%          
Current portion of long-term debt       $ 295,000,000.0     $ 295,000,000.0        
Loan redeption period after rdemption notice   30 days                  
Debt instrument stated interest rate       5.75%     5.75%        
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redeemed on July 9, 2020 [Member]                      
Debt Instrument [Line Items]                      
Debt redemeed aggregate 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 aggregate amount     $ 100,000,000                
Debt instrument, redemption price as percentage of principal amount     100.958%                
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Subsequent Event [Member] | Notes Redeemed on July 16, 2021 [Member]                      
Debt Instrument [Line Items]                      
Debt redemeed aggregate amount $ 295,000,000.0                    
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       150,000,000.0     150,000,000.0        
Borrowings outstanding       0     0        
Credit Line [Member] | Letter of Credit [Member]                      
Debt Instrument [Line Items]                      
Line of credit facility borrowing capacity       $ 10,000,000.0     $ 10,000,000.0        
Real Estate Loan (the “Loan”) [Member] | Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member]                      
Debt Instrument [Line Items]                      
Debt instrument principal amount   $ 155,000,000                  
Debt instrument term   10 years                  
Debt extinguishment costs           $ 3,700,000          
Debt instrument, periodic principal payment   $ 650,000                  
Debt maturity date             Jan. 31, 2030