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Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2021
Jul. 31, 2020
Jun. 30, 2020
Nov. 30, 2019
Dec. 31, 2010
Jun. 26, 2021
Sep. 26, 2020
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Debt Instrument [Line Items]                    
Loss on early extinguishment of debt               $ (1,082,633) $ (7,101,153)  
Other comprehensive income, net of tax               6,825,156 (8,985,646) $ (1,265,650)
Other assets             $ 28,031,634 31,989,010 28,031,634  
Payment of debt extinguishment costs                 5,366,350  
Other comprehensive expense, net of income taxes               9,031,156 (11,887,660) $ (1,674,636)
Other long-term liabilities             55,659,943 50,418,947 55,659,943  
Property and equipment with undepreciated cost pledge as collateral for long term debt               280,200,000    
Line [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 comprehensive expense, net of income taxes               6,800,000 9,000,000.0  
Other long-term liabilities             $ 13,600,000 4,500,000 $ 13,600,000  
Interest Rate Swap at Fixed Rate of 3.92% [Member]                    
Debt Instrument [Line Items]                    
Derivative notional amount               $ 36,500,000    
Derivative, fixed interest rate               3.92%    
Derivative maturity date               Oct. 01, 2027    
Monthly principal amortization               $ 500,000    
Interest Rate Swap at Fixed Rate of 3.92% [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               $ 140,100,000    
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]                    
Loss on early extinguishment of debt       $ 3,700,000            
Debt instrument stated interest rate             5.75% 5.75% 5.75%  
Loan redeption period after rdemption notice       30 days            
Debt instrument, redemption price as percentage of principal amount       101.917%            
Debt instrument outstanding amount             $ 295,000,000.0   $ 295,000,000.0  
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redemeed 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 redemeed amount     $ 150,000,000              
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redemeed 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 redemeed amount   $ 100,000,000                
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redemeed on June 26, 2021 [Member]                    
Debt Instrument [Line Items]                    
Loss on early extinguishment of debt           $ 1,100,000        
Debt redemeed 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%    
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            
Debt instrument, periodic principal payment       $ 650,000            
Debt maturity date               Jan. 31, 2030