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Postretirement Benefits (Tables)
9 Months Ended
Jun. 26, 2020
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost The net periodic benefit credit was as follows: 
Three months endedNine months ended
(in thousands)NoteJune 26, 2020June 28, 2019June 26, 2020June 28, 2019
Interest cost$935  $1,166  $2,805  $3,498  
Expected return on plan assets(1,583) (1,593) (4,749) (4,779) 
Amortization of actuarial loss222  25  666  75  
Net periodic benefit credit7$(426) $(402) $(1,278) $(1,206)