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Employee Pension and Profit Sharing Plans - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Retirement Benefits [Abstract]      
Service cost $ 6,391 $ 7,121 $ 8,834
Interest cost 11,287 10,579 8,398
Expected return on plan assets (22,970) (22,864) (18,350)
Settlements and curtailments 283 3,312 0
Amortization of prior service cost 104 116 122
Recognized net loss 1,094 1,646 3,400
Net periodic pension cost (income) $ (3,811) $ (90) $ 2,404