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Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2019
Jun. 30, 2021
Jul. 31, 2020
Jun. 30, 2020
Dec. 31, 2010
Jun. 26, 2021
Sep. 26, 2020
Dec. 28, 2019
Sep. 24, 2022
Sep. 25, 2021
Sep. 26, 2020
Jun. 20, 2020
Dec. 31, 2019
Sep. 30, 2017
Debt Instrument [Line Items]                            
Current portion of long-term debt                 $ 17,620,789 $ 17,600,739        
Short term investments                   5,000,000        
Loss on early extinguishment of debt                   (1,082,633) $ (7,101,153)      
Payment of debt extinguishment costs                     5,366,350      
OTHER LONG-TERM LIABILITIES                 41,479,220 50,418,947        
Property and equipment with undepreciated cost pledge as collateral for long term debt                 269,000,000.0          
Line of credit payable [Member]                            
Debt Instrument [Line Items]                            
Line of credit facility borrowing capacity   $ 150,000,000.0                        
Borrowings outstanding                 0          
Letter of Credit [Member]                            
Debt Instrument [Line Items]                            
Line of credit facility borrowing capacity   10,000,000.0                        
Borrowings outstanding                 0          
Cash Flow Hedging [Member]                            
Debt Instrument [Line Items]                            
OTHER LONG-TERM LIABILITIES                 16,400,000          
Unrealized gains (losses) on cash flow hedge                   4,500,000        
Other comprehensive income, net of income taxes                 15,800,000 $ 6,800,000        
Interest Rate Swaps Derivative Contract Asset [Member]                            
Debt Instrument [Line Items]                            
Derivative notional amount                 $ 30,500,000          
Derivative, fixed interest rate                 3.92%          
Derivative maturity date                 Oct. 01, 2027          
Monthly principal amortization                 $ 500,000          
Interest Rate Swaps Derivative Contract Asset [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                 $ 132,400,000          
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 5.75%, Maturing 2023 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument stated interest rate                       5.75%    
Debt maturity date                 Dec. 31, 2023          
Debt instrument outstanding amount             $ 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]                            
Loss on early extinguishment of debt             2,000,000.0              
Debt instrument, redemption price as percentage of principal amount       100.958%                    
Debt redeemed amount       $ 150,000,000                    
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redeemed on August 27, 2020 [Member]                            
Debt Instrument [Line Items]                            
Loss on early extinguishment of debt             $ 1,400,000              
Debt instrument, redemption price as percentage of principal amount     100.958%                      
Debt redeemed amount     $ 100,000,000                      
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redeemed on June 26, 2021 [Member]                            
Debt Instrument [Line Items]                            
Loss on early extinguishment of debt           $ 1,100,000                
Debt redeemed amount   295,000,000.0                        
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%          
Senior Notes, Interest Rate of 4.00%, Maturing 2031 [Member] | Invested in Short Term Investments Pending Redemption Of 2023 Notes [Member]                            
Debt Instrument [Line Items]                            
Proceeds from issuance of long term debt   $ 295,000,000.0                        
Senior Notes, Interest Rate of 4.00%, Maturing 2031 [Member] | May Redeem Prior To June 15, 2026 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, redemption price as percentage of principal amount                 100.00%          
Senior Notes, Interest Rate of 4.00%, Maturing 2031 [Member] | May Redeem Prior To June 15, 2024 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, redemption price as percentage of principal amount                 104.00%          
Debt instrument redemption percentage                 40.00%          
Debt instrument redemption percentage outstanding                 60.00%          
Secured Debt Maturing January 2030 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument principal amount                         $ 155,000,000  
Secured Debt Maturing October 2027 [Member]                            
Debt Instrument [Line Items]                            
Secured borrowing                           $ 60,000,000
Recovery Zone Facility Bonds [Member]                            
Debt Instrument [Line Items]                            
Debt instrument principal amount         $ 99,700,000                  
Debt maturity date         Jan. 01, 2036                  
Annual amount of redemption of bonds                 $ 4,500,000          
Loan [Member]                            
Debt Instrument [Line Items]                            
Debt instrument principal amount $ 155,000,000                          
Loss on early extinguishment of debt               $ 3,700,000            
Loan redemption period after redemption notice 30 days                          
Debt instrument, redemption price as percentage of principal amount 101.917%