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Long-Term Debt (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2019
Jun. 30, 2021
Sep. 30, 2017
Jun. 29, 2024
Jun. 24, 2023
Jun. 29, 2024
Jun. 24, 2023
Dec. 31, 2010
Debt Instrument [Line Items]                
Property and equipment with undepreciated cost pledge as collateral for long term debt       $ 250,400,000   $ 250,400,000    
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]           us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember    
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line       511,000,000.0   $ 511,000,000.0    
Line of Credit [Member]                
Debt Instrument [Line Items]                
Line of credit facility borrowing capacity       150,000,000.0   150,000,000.0    
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         $ 1,900,000   $ (1,300,000)  
Other comprehensive income (loss), net of income taxes       (300,000)   (3,000,000.0)    
Unrealized gains (losses) on cash flow hedge         $ 14,800,000 $ 13,600,000    
Interest Rate Swap [Member]                
Debt Instrument [Line Items]                
Derivative notional amount $ 118,800,000              
Senior Notes, Maturing 2031 [Member]                
Debt Instrument [Line Items]                
Debt instrument principal amount   $ 350,000,000.0            
Debt instrument stated interest rate   4.00%            
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]                
Debt maturity date           Oct. 01, 2027    
Derivative notional amount       $ 20,000,000.0   $ 20,000,000.0    
Derivative, fixed interest rate       3.962%   3.962%    
Monthly principal amortization           $ 500,000    
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, fixed interest rate 2.998%              
Monthly principal amortization $ 650,000              
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
Credit Line [Member] | Line of Credit [Member]                
Debt Instrument [Line Items]                
Borrowings outstanding       $ 0   $ 0    
Line Of Credit Maturing September 2022 [Member] | Line of Credit [Member]                
Debt Instrument [Line Items]                
Debt maturity date           Jun. 01, 2026