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Long-Term Debt (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2019
Sep. 30, 2017
Mar. 30, 2024
Mar. 25, 2023
Mar. 30, 2024
Mar. 25, 2023
Jun. 26, 2021
Dec. 31, 2010
Debt Instrument [Line Items]                
Property and equipment with undepreciated cost pledge as collateral for long term debt     $ 252,200,000   $ 252,200,000      
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line     498,500,000   498,500,000      
Line of Credit [Member]                
Debt Instrument [Line Items]                
Line of credit facility borrowing capacity     $ 150,000,000.0   150,000,000.0      
Debt maturity date     Jun. 30, 2026          
Letter of Credit [Member]                
Debt Instrument [Line Items]                
Line of credit facility borrowing capacity     $ 10,000,000.0   10,000,000.0      
Cash Flow Hedging [Member]                
Debt Instrument [Line Items]                
Other comprehensive loss, net of income taxes     $ 1,100,000 $ 2,000,000.0 2,700,000 $ 3,200,000    
Unrealized gains (losses) on cash flow hedge         $ 14,000,000.0 $ 12,200,000    
Senior Notes, Maturing 2031 [Member]                
Debt Instrument [Line Items]                
Debt instrument principal amount             $ 350,000,000.0  
Debt instrument stated interest rate     4.00%   4.00%      
Maturity period of senior notes         2031      
Secured Debt Maturing October 2027 [Member]                
Debt Instrument [Line Items]                
Debt maturity date   Oct. 01, 2027            
Secured borrowing   $ 60,000,000            
Secured Debt Maturing October 2027 [Member] | Interest Rate Swap [Member]                
Debt Instrument [Line Items]                
Derivative notional amount     $ 21,500,000   $ 21,500,000      
Derivative, fixed interest rate     3.962%   3.962%      
Monthly principal amortization         $ 500,000      
Derivative maturity date         Oct. 01, 2027      
Secured Debt Maturing October 2027 [Member] | Interest Rate Swap [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                
Debt Instrument [Line Items]                
Debt instrument variable interest rate         1.75%      
Secured Debt Maturing January 2030 [Member]                
Debt Instrument [Line Items]                
Debt instrument principal amount $ 155,000,000              
Debt maturity date Jan. 01, 2030              
Secured Debt Maturing January 2030 [Member] | Interest Rate Swap [Member]                
Debt Instrument [Line Items]                
Derivative notional amount $ 120,800,000              
Derivative, fixed interest rate 2.998%   2.998%   2.998%      
Monthly principal amortization $ 650,000              
Secured Debt Maturing January 2030 [Member] | Interest Rate Swap [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                
Debt Instrument [Line Items]                
Debt instrument variable interest rate 1.60%              
Recovery Zone Facility Bonds [Member]                
Debt Instrument [Line Items]                
Debt maturity date         Jan. 01, 2036      
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      
Total amount of bonds funded     $ 49,900,000   $ 49,900,000     $ 99,700,000