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	Jun. 27, 2026	Sep. 27, 2025
Carrying Amount [Member] \| Interest Rate Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	$ 7,093	$ 7,416
Carrying Amount [Member] \| Non-Qualified Retirement Plan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement plan assets	32,749	29,881
Fair Value [Member] \| Interest Rate Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	7,093	7,416
Fair Value [Member] \| Non-Qualified Retirement Plan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement plan assets	32,749	29,881
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	328,125	327,250
Facility Bonds Due 2036 [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	40,850	45,380
Facility Bonds Due 2036 [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	40,850	45,380
Secured Notes Payable and Other [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	109,677	119,387
Secured Notes Payable and Other [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ 109,677	$ 119,387