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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 | Mar. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Carrying Amount [Member] | Interest Rate Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | $ 13,958 | $ 17,515
Carrying Amount [Member] | Non-Qualified Retirement Plan [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Retirement plan assets | 24,780 | 20,074
Fair Value [Member] | Interest Rate Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 13,958 | 17,515
Fair Value [Member] | Non-Qualified Retirement Plan [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Retirement plan assets | 24,780 | 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 | 305,375 | 287,875
Facility Bonds Due 2036 [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt | 49,910 | 54,440
Facility Bonds Due 2036 [Member] | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt | 49,910 | 54,440
Secured Notes Payable and Other [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt | 139,208 | 145,718
Secured Notes Payable and Other [Member] | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt | $ 139,208 | $ 145,718

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