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Postretirement and Postemployment Benefits - Narrative (Details) - USD ($)
 12 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Sep. 24, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Amortization of prior service cost (credit) expected to be recognized during the next fiscal year $ 800,000    
Other Postretirement Benefits Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net actuarial gain expected to be recognized in net periodic pension cost during next fiscal year 1,000,000.0    
Amortization of prior service cost (credit) expected to be recognized during the next fiscal year $ 300,000    
Assumptions used calculating net periodic benefit cost, expected long-term rate of return on plan assets 6.00% 5.00% 5.00%
Non-current assets $ 22,407,000 $ 23,300,000  
Pension assets 26,284,000 27,570,000 $ 25,809,000
Postemployment benefit obligation 7,631,000 10,217,000 11,252,000
Other Postretirement Benefits Plan | Level 3 | Hedge fund investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension assets 0 0  
Other Postretirement Benefits Plan | NAV | Hedge fund investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension assets 213,000 236,000  
Postemployment Retirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Curtailment gain 0 1,184,000 0
Postemployment benefit obligation 1,600,000 1,600,000  
Retiree Medical Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Non-current assets 600,000 500,000  
Medical Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Curtailment gain   1,200,000  
Non-current assets 22,407,000 23,300,000  
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Curtailment gain $ 0 $ 0 $ 0
Assumptions used calculating net periodic benefit cost, expected long-term rate of return on plan assets 5.00% 5.00% 5.00%
Non-current assets $ 10,828,000 $ 4,663,000  
Pension assets 186,352,000 193,192,000 $ 210,031,000
Expected future employer contributions, current fiscal year 0    
Postemployment benefit obligation 175,524,000 188,528,000 $ 199,187,000
Pension Plan | Level 3 | Hedge fund investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension assets 0 0  
Pension Plan | NAV | Hedge fund investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension assets $ 1,934,000 $ 5,931,000