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Postretirement Benefits
 3 Months Ended
Dec. 27, 2019
Retirement Benefits [Abstract]  
Postretirement Benefits
5. POSTRETIREMENT BENEFITS

The Company provides pension benefits through a number of noncontributory and contributory defined benefit retirement plans covering eligible U.S. employees. As of September 30, 2017, all defined pension benefit plans were frozen, whereby participants no longer accrue credited service. 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
)