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Pension and Other Benefit Programs (Tables)
 9 Months Ended
Jul. 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
 
Nine Months Ended
 
Quarter Ended
 
Nine Months Ended
 
July 1, 2017
 
July 2, 2016
 
July 1, 2017
 
July 2, 2016
 
July 1, 2017
 
July 2, 2016
 
July 1, 2017
 
July 2, 2016
Service costs
$
90

 
$
80

 
$
273

 
$
239

 
$
3

 
$
2

 
$
9

 
$
8

Interest costs
113

 
115

 
336

 
344

 
14

 
16

 
42

 
46

Expected return on plan assets
(219
)
 
(186
)
 
(656
)
 
(560
)
 
(13
)
 
(12
)
 
(37
)
 
(34
)
Amortization of prior-year service costs
3

 
3

 
8

 
10

 
—

 
(1
)
 
—

 
(1
)
Recognized net actuarial loss
101

 
61

 
303

 
182

 
4

 
2

 
12

 
6

Net periodic benefit cost
$
88

 
$
73

 
$
264

 
$
215

 
$
8

 
$
7

 
$
26

 
$
25