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Postretirement Benefits (Tables)
 3 Months Ended
Dec. 27, 2019
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost The net periodic benefit credit was as follows: 
 
 
 
 
Three months ended
(in thousands)
 
Note
 
December 27, 2019
 
December 28, 2018
Interest cost
 
 
 
$
935

 
$
1,166

Expected return on plan assets
 
 
 
(1,583
)
 
(1,593
)
Amortization of actuarial loss
 
 
 
222

 
25

Net periodic benefit credit
 
7
 
$
(426
)
 
$
(402
)