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Pension and Other Benefit Programs (Tables)
 3 Months Ended
Dec. 30, 2017
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost
The components of net periodic benefit cost are as follows: 
 
Pension Plans
 
Postretirement Medical Plans
 
Quarter Ended
 
Quarter Ended
 
December 30, 2017
 
December 31, 2016
 
December 30, 2017
 
December 31, 2016
Service costs
$
88

 
$
91

 
$
3

 
$
3

Interest costs
123

 
112

 
15

 
14

Expected return on plan assets
(225
)
 
(219
)
 
(13
)
 
(12
)
Amortization of prior-year service costs
3

 
3

 
—

 
—

Recognized net actuarial loss
87

 
101

 
3

 
4

Net periodic benefit cost
$
76

 
$
88

 
$
8

 
$
9