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POSTRETIREMENT AND POSTEMPLOYMENT BENEFITS - Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 29, 2024
Sep. 24, 2023
Sep. 25, 2022
Other Postretirement Benefits Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year $ 11,252 $ 12,287  
Service cost 50 68  
Interest cost 596 598  
Actuarial loss (gain) 1,215 (1,049)  
Benefits paid, net of premiums received (1,712) (652)  
Benefit obligation, end of year 10,217 11,252 $ 12,287
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets, beginning of year: 25,809 23,903  
Actual return on plan assets 2,615 2,393  
Employer contributions 858 165  
Benefits paid, net of premiums and Medicare Part D subsidies received (1,712) (660)  
Plan participant contributions 0 8  
Fair value of plan assets, end of year 27,570 25,809 23,903
Funded status 17,353 14,557  
Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 199,187 210,806  
Service cost 5 19 488
Interest cost 9,274 10,368 7,999
Actuarial loss (gain) 15,703 (9,876)  
Benefits paid, net of premiums received (13,021) (12,130)  
Liability (gain)/loss due to curtailment (1,184) 0 (1,000)
Benefit obligation, end of year 188,528 199,187 210,806
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets, beginning of year: 210,031 211,058  
Actual return on plan assets 19,957 12,638  
Fair value of plan assets, end of year 193,192 210,031 $ 211,058
Funded status $ 4,664 $ 10,844