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Postretirement Benefits
 6 Months Ended
Mar. 27, 2020
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
 
Six months ended
(in thousands)
 
Note
 
March 27, 2020
 
March 29, 2019
 
March 27, 2020
 
March 29, 2019
Interest cost
 
 
 
$
935

 
$
1,166

 
$
1,870

 
$
2,332

Expected return on plan assets
 
 
 
(1,583
)
 
(1,593
)
 
(3,166
)
 
(3,186
)
Amortization of actuarial loss
 
 
 
222

 
25

 
444

 
50

Net periodic benefit credit
 
7
 
$
(426
)
 
$
(402
)
 
$
(852
)
 
$
(804
)