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Long-Term Debt (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2021
Sep. 30, 2017
Jun. 24, 2023
Jun. 25, 2022
Jun. 24, 2023
Jun. 25, 2022
Dec. 31, 2019
Dec. 31, 2010
Debt Instrument [Line Items]                
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         Dec. 17, 2029      
Derivative notional amount     126,600,000   $ 126,600,000      
Property and equipment with undepreciated cost pledge as collateral for long term debt     256,400,000   256,400,000      
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line     444,300,000   444,300,000      
Interest Rate Swaps Derivative Contract Asset [Member]                
Debt Instrument [Line Items]                
Unrealized gains (losses) on cash flow hedge         14,800,000      
Other comprehensive income (loss), net of income taxes     $ 1,900,000 $ 3,300,000 $ 1,300,000 $ 12,200,000    
Senior Notes, Interest Rate of 4.00%, Maturing 2031 [Member]                
Debt Instrument [Line Items]                
Debt instrument principal amount $ 350,000,000.0              
Maturity period of senior notes 2031              
Debt instrument stated interest rate 4.00%              
Secured Debt Maturing January 2030 [Member]                
Debt Instrument [Line Items]                
Debt instrument principal amount             $ 155,000,000  
Derivative, fixed interest rate     2.998%   2.998%      
Debt instrument variable interest rate         1.60%      
Monthly principal amortization         $ 650,000      
Secured Debt Maturing 2037 [Member]                
Debt Instrument [Line Items]                
Debt maturity date   Oct. 01, 2027     Oct. 01, 2027      
Secured borrowing   $ 60,000,000            
Derivative notional amount     $ 26,000,000.0   $ 26,000,000.0      
Derivative, fixed interest rate     3.962%   3.962%      
Monthly principal amortization         $ 500,000      
Secured Debt Maturing 2037 [Member] | One-Month LIBOR [Member]                
Debt Instrument [Line Items]                
Debt instrument variable interest rate         1.75%      
Line of credit Maturing September 2022 [Member]                
Debt Instrument [Line Items]                
Debt maturity date         Jun. 01, 2026      
Line of credit facility borrowing capacity     $ 150,000,000.0   $ 150,000,000.0      
Facility Bonds Due 2036 [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 SOFR (adjusted monthly) plus a credit spread, adjusted to reflect the income tax exemption.      
Debt instrument outstanding amount     54,400,000   $ 54,400,000     $ 99,700,000
Credit Line [Member]                
Debt Instrument [Line Items]                
Borrowings outstanding     0   0      
Credit Line [Member] | Unused Letters Of Credit [Member]                
Debt Instrument [Line Items]                
Line of credit facility borrowing capacity     $ 10,000,000.0   $ 10,000,000.0