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Pension and Other Benefit Programs (Tables)
 9 Months Ended
Jun. 29, 2019
Retirement Benefits [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
 
Jun. 29,
2019
 
Jun. 30,
2018
 
Jun. 29,
2019
 
Jun. 30,
2018
 
Jun. 29,
2019
 
Jun. 30,
2018
 
Jun. 29,
2019
 
Jun. 30,
2018
Service costs
$
89

 
$
87

 
$
255

 
$
262

 
$
2

 
$
3

 
$
6

 
$
8

Other costs (benefits):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest costs
152

 
122

 
441

 
367

 
17

 
15

 
50

 
45

Expected return on plan assets
(250
)
 
(225
)
 
(729
)
 
(677
)
 
(14
)
 
(13
)
 
(42
)
 
(39
)
Amortization of prior-year service costs
3

 
3

 
10

 
11

 
—

 
—

 
—

 
—

Recognized net actuarial loss
65

 
86

 
196

 
261

 
—

 
3

 
—

 
10

Total other costs (benefits)
(30
)
 
(14
)
 
(82
)
 
(38
)
 
3

 
5

 
8

 
16

Net periodic benefit cost
$
59

 
$
73

 
$
173

 
$
224

 
$
5

 
$
8

 
$
14

 
$
24