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Retirement Plans Retirement Plans (Tables)
 12 Months Ended
Sep. 27, 2019
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Schedule of Costs of Retirement Plans
Retirement plan expenses, which are included in cost of products, cost of services, R&D, S&M, and G&A expense in our consolidated statements of operations, were as follows (in thousands):
 
Fiscal Year Ended
 
September 27,
2019
September 28,
2018
September 29,
2017
Retirement plan expenses
$
23,375

$
23,439

$
22,035