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Pension and Other Benefit Programs (Tables)
 6 Months Ended
Apr. 01, 2017
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost
The components of net periodic benefit cost are as follows: 
 
Pension Plans
 
Postretirement Medical Plans
 
Quarter Ended
 
Six Months Ended
 
Quarter Ended
 
Six Months Ended
 
April 1, 2017
 
April 2, 2016
 
April 1, 2017
 
April 2, 2016
 
April 1, 2017
 
April 2, 2016
 
April 1, 2017
 
April 2, 2016
Service costs
$
92

 
$
79

 
$
183

 
$
159

 
$
3

 
$
3

 
$
6

 
$
6

Interest costs
111

 
114

 
223

 
229

 
14

 
15

 
28

 
30

Expected return on plan assets
(218
)
 
(186
)
 
(437
)
 
(374
)
 
(12
)
 
(11
)
 
(24
)
 
(22
)
Amortization of prior-year service costs
2

 
4

 
5

 
7

 
—

 
—

 
—

 
—

Recognized net actuarial loss
101

 
60

 
202

 
121

 
4

 
2

 
8

 
4

Net periodic benefit cost
$
88

 
$
71

 
$
176

 
$
142

 
$
9

 
$
9

 
$
18

 
$
18