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Retirement Plans (Tables)
 6 Months Ended
Apr. 12, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost The components of net periodic benefit cost in each period were as follows (in thousands): 
QuarterYear-to-date
April 12,
2020		April 14,
2019		April 12,
2020		April 14,
2019
Defined benefit pension plans:
Interest cost$3,669  $5,286  $8,745  $12,334  
Expected return on plan assets (1)(4,706) (6,077) (11,362) (14,181) 
Pension settlements (2)321  —  38,927  —  
Actuarial losses (2)1,019  913  2,691  2,132  
Amortization of unrecognized prior service costs (2)19  27  45  62  
Net periodic benefit cost $322  $149  $39,046  $347  
Postretirement healthcare plans:
Interest cost$187  $230  $435  $537  
Actuarial losses (gains) (2)3  (36) 9  (85) 
Net periodic benefit cost $190  $194  $444  $452  
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(1)Based on a return on asset, net of administrative expenses, assumption of 5.8% determined at the end of fiscal 2019, subsequently updated to 5.9% as of December 31, 2019 and 5.2% as of March 31, 2020, upon remeasurement of the Qualified Plan’s assets and PBO as required by settlement accounting.
(2)Amounts were reclassified from accumulated OCI into net earnings as a component of “Other pension and post-retirement expenses, net
Schedule of Defined Benefit Plan Contribution Details regarding 2020 contributions are as follows (in thousands):
SERPPostretirement
Healthcare Plans
Net year-to-date contributions$2,857  $725  
Remaining estimated net contributions during fiscal 2020$2,514  $676