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Pension and Other Benefit Programs (Tables)
 3 Months Ended
Dec. 31, 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
 
Quarter Ended
 
December 31, 2016
 
January 2, 2016
 
December 31, 2016
 
January 2, 2016
Service costs
$
91

 
$
80

 
$
3

 
$
3

Interest costs
112

 
115

 
14

 
15

Expected return on plan assets
(219
)
 
(188
)
 
(12
)
 
(11
)
Amortization of prior-year service costs
3

 
3

 
—

 
—

Recognized net actuarial loss
101

 
61

 
4

 
2

Net periodic benefit cost
$
88

 
$
71

 
$
9

 
$
9