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Pension and Other Benefit Programs (Tables)
 3 Months Ended
Dec. 27, 2014
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
 
Quarter Ended
 
December 27, 2014
 
December 28, 2013
 
December 27, 2014
 
December 28, 2013
Service costs
$
83

 
$
71

 
$
4

 
$
3

Interest costs
131

 
122

 
17

 
16

Expected return on plan assets
(178
)
 
(161
)
 
(10
)
 
(9
)
Amortization of prior-year service costs
4

 
4

 
—

 
—

Recognized net actuarial loss/(gain)
62

 
36

 
3

 
(2
)
Net periodic benefit cost
$
102

 
$
72

 
$
14

 
$
8