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Pension and Other Benefit Programs (Tables)
 3 Months Ended
Dec. 28, 2019
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost
The components of net periodic benefit cost are as follows: 
 Pension PlansPostretirement Medical Plans
 Quarter EndedQuarter Ended
 December 28, 2019December 29, 2018December 28, 2019December 29, 2018
Service costs$103  $83  $3  $2  
Other costs (benefits):
Interest costs133  145  14  16  
Expected return on plan assets
(273) (239) (14) (14) 
Amortization of prior-year service costs
3  3  —  —  
Recognized net actuarial loss
131  64  3  —  
Total other costs (benefits)
(6) (27) 3  2  
Net periodic benefit cost
$97  $56  $6  $4