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Pension and Other Benefit Programs (Tables)
 3 Months Ended
Dec. 29, 2018
Retirement Benefits [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 29, 2018
 
December 30, 2017
 
December 29, 2018
 
December 30, 2017
Service costs
$
83

 
$
88

 
$
2

 
$
3

Other costs (benefits):
 
 
 
 
 
 
 
Interest costs
145

 
123

 
16

 
15

Expected return on plan assets
(239
)
 
(225
)
 
(14
)
 
(13
)
Amortization of prior-year service costs
3

 
3

 
—

 
—

Recognized net actuarial loss
64

 
87

 
—

 
3

Total other costs (benefits)
(27
)
 
(12
)
 
2

 
5

Net periodic benefit cost
$
56

 
$
76

 
$
4

 
$
8