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Pension and Other Benefit Programs (Tables)
 6 Months Ended
Mar. 28, 2015
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
 
March 28, 2015
 
March 29, 2014
 
March 28, 2015
 
March 29, 2014
 
March 28, 2015
 
March 29, 2014
 
March 28, 2015
 
March 29, 2014
Service costs
$
83

 
$
71

 
$
166

 
$
142

 
$
3

 
$
2

 
$
7

 
$
5

Interest costs
131

 
122

 
262

 
244

 
17

 
17

 
34

 
33

Expected return on
  plan assets
(178
)
 
(162
)
 
(356
)
 
(323
)
 
(9
)
 
(9
)
 
(19
)
 
(18
)
Amortization of prior-
  year service costs
4

 
3

 
8

 
7

 
(1
)
 
(1
)
 
(1
)
 
(1
)
Recognized net
  actuarial loss/(gain)
61

 
37

 
123

 
73

 
2

 
(2
)
 
5

 
(4
)
Net periodic benefit
  cost
$
101

 
$
71

 
$
203

 
$
143

 
$
12

 
$
7

 
$
26

 
$
15