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Pension and Other Benefit Programs (Tables)
 9 Months Ended
Jun. 30, 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
 
Nine Months Ended
 
Quarter Ended
 
Nine Months Ended
 
June 30, 2018
 
July 1, 2017
 
June 30, 2018
 
July 1, 2017
 
June 30, 2018
 
July 1, 2017
 
June 30, 2018
 
July 1, 2017
Service costs
$
87

 
$
90

 
$
262

 
$
273

 
$
3

 
$
3

 
$
8

 
$
9

Interest costs
122

 
113

 
367

 
336

 
15

 
14

 
45

 
42

Expected return on plan assets
(225
)
 
(219
)
 
(677
)
 
(656
)
 
(13
)
 
(13
)
 
(39
)
 
(37
)
Amortization of prior-year service costs
3

 
3

 
11

 
8

 
—

 
—

 
—

 
—

Recognized net actuarial loss
86

 
101

 
261

 
303

 
3

 
4

 
10

 
12

Net periodic benefit cost
$
73

 
$
88

 
$
224

 
$
264

 
$
8

 
$
8

 
$
24

 
$
26