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Retirement Plans Retirement Plans (Tables)
 12 Months Ended
Sep. 24, 2021
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 and services, R&D, S&M, and G&A expense in our consolidated statements of operations, were as follows (in thousands):
 Fiscal Year Ended
 September 24,
2021		September 25,
2020		September 27,
2019
Retirement plan expenses$26,379 $25,257 $23,375