v3.26.1
PENSION, POSTRETIREMENT AND POSTEMPLOYMENT DEFINED BENEFIT PLANS - Net Periodic Cost (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 29, 2026
Mar. 30, 2025
Mar. 29, 2026
Mar. 30, 2025
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned during the period $ 1 $ 1 $ 2 $ 2
Interest cost on projected benefit obligation 1,977 2,034 3,954 4,068
Expected return on plan assets (2,467) (2,319) (4,934) (4,637)
Amortization of prior service benefit 212 212 424 424
Net periodic pension benefit (277) (72) (554) (143)
Postretirement Medical Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned during the period 0 1 0 2
Interest cost on projected benefit obligation 83 108 166 217
Expected return on plan assets (391) (410) (782) (821)
Amortization of net (gain) loss (245) (292) (490) (584)
Amortization of prior service benefit (71) (71) (142) (142)
Net periodic pension benefit $ (624) $ (664) $ (1,248) $ (1,328)