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Fair Values of Financial Instruments (Carrying Amount and Fair Value of Debt, Interest Rate Swap and Non-Qualified Plan Assets) (Details) - Level 2 [Member] - USD ($)
$ in Thousands
Dec. 30, 2023
Sep. 30, 2023
Carrying Amount [Member] | Interest Rate Swap [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets $ 12,447 $ 17,515
Carrying Amount [Member] | Non-Qualified Retirement Plan [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Retirement plan assets 23,330 20,074
Fair Value [Member] | Interest Rate Swap [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 12,447 17,515
Fair Value [Member] | Non-Qualified Retirement Plan [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Retirement plan assets 23,330 20,074
Senior Notes Due 2031 [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt 350,000 350,000
Senior Notes Due 2031 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt 308,875 287,875
Facility Bonds Due 2036 [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt 54,440 54,440
Facility Bonds Due 2036 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt 54,440 54,440
Secured Notes Payable and Other [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt 142,456 145,718
Secured Notes Payable and Other [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt $ 142,456 $ 145,718