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Pension and Other Benefit Programs (Tables)
 9 Months Ended
Jul. 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
 
Nine Months Ended
 
Quarter Ended
 
Nine Months Ended
 
July 2, 2016
 
June 27, 2015
 
July 2, 2016
 
June 27, 2015
 
July 2, 2016
 
June 27, 2015
 
July 2, 2016
 
June 27, 2015
Service costs
$
80

 
$
82

 
$
239

 
$
248

 
$
2

 
$
4

 
$
8

 
$
11

Interest costs
115

 
129

 
344

 
391

 
16

 
17

 
46

 
51

Expected return on plan assets
(186
)
 
(178
)
 
(560
)
 
(534
)
 
(12
)
 
(10
)
 
(34
)
 
(29
)
Amortization of prior-year service costs
3

 
4

 
10

 
12

 
(1
)
 
—

 
(1
)
 
(1
)
Recognized net actuarial loss
61

 
62

 
182

 
185

 
2

 
3

 
6

 
8

Net periodic benefit cost
$
73

 
$
99

 
$
215

 
$
302

 
$
7

 
$
14

 
$
25

 
$
40