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Pension and Other Benefit Programs (Tables)
 6 Months Ended
Mar. 31, 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
 
Six Months Ended
 
Quarter Ended
 
Six Months Ended
 
March 31, 2018
 
April 1, 2017
 
March 31, 2018
 
April 1, 2017
 
March 31, 2018
 
April 1, 2017
 
March 31, 2018
 
April 1, 2017
Service costs
$
87

 
$
92

 
$
175

 
$
183

 
$
2

 
$
3

 
$
5

 
$
6

Interest costs
122

 
111

 
245

 
223

 
15

 
14

 
30

 
28

Expected return on plan assets
(227
)
 
(218
)
 
(452
)
 
(437
)
 
(13
)
 
(12
)
 
(26
)
 
(24
)
Amortization of prior-year service costs
5

 
2

 
8

 
5

 
—

 
—

 
—

 
—

Recognized net actuarial loss
88

 
101

 
175

 
202

 
4

 
4

 
7

 
8

Net periodic benefit cost
$
75

 
$
88

 
$
151

 
$
176

 
$
8

 
$
9

 
$
16

 
$
18