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Pension and Other Benefit Programs (Tables)
 6 Months Ended
Apr. 02, 2016
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 2, 2016
 
March 28, 2015
 
April 2, 2016
 
March 28, 2015
 
April 2, 2016
 
March 28, 2015
 
April 2, 2016
 
March 28, 2015
Service costs
$
79

 
$
83

 
$
159

 
$
166

 
$
3

 
$
3

 
$
6

 
$
7

Interest costs
114

 
131

 
229

 
262

 
15

 
17

 
30

 
34

Expected return on plan assets
(186
)
 
(178
)
 
(374
)
 
(356
)
 
(11
)
 
(9
)
 
(22
)
 
(19
)
Amortization of prior-year service costs
4

 
4

 
7

 
8

 
—

 
(1
)
 
—

 
(1
)
Recognized net actuarial loss
60

 
61

 
121

 
123

 
2

 
2

 
4

 
5

Net periodic benefit cost
$
71

 
$
101

 
$
142

 
$
203

 
$
9

 
$
12

 
$
18

 
$
26