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Pension and Other Benefit Programs (Tables)
 6 Months Ended
Mar. 30, 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
 
Six Months Ended
 
Quarter Ended
 
Six Months Ended
 
Mar. 30,
2019
 
Mar. 31,
2018
 
Mar. 30,
2019
 
Mar. 31,
2018
 
Mar. 30,
2019
 
Mar. 31,
2018
 
Mar. 30,
2019
 
Mar. 31,
2018
Service costs
$
83

 
$
87

 
$
166

 
$
175

 
$
2

 
$
2

 
$
4

 
$
5

Other costs (benefits):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest costs
144

 
122

 
289

 
245

 
17

 
15

 
33

 
30

Expected return on plan assets
(240
)
 
(227
)
 
(479
)
 
(452
)
 
(14
)
 
(13
)
 
(28
)
 
(26
)
Amortization of prior-year service costs
4

 
5

 
7

 
8

 
—

 
—

 
—

 
—

Recognized net actuarial loss
67

 
88

 
131

 
175

 
—

 
4

 
—

 
7

Total other costs (benefits)
(25
)
 
(12
)
 
(52
)
 
(24
)
 
3

 
6

 
5

 
11

Net periodic benefit cost
$
58

 
$
75

 
$
114

 
$
151

 
$
5

 
$
8

 
$
9

 
$
16