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Retirement Plans
 12 Months Ended
Sep. 24, 2021
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Retirement Plans Retirement Plans
We maintain a tax-qualified Section 401(k) retirement plan for employees in the U.S. and similar plans in foreign jurisdictions. Under the plan, employees are eligible to receive matching contributions and profit-sharing contributions. We also maintain a SERP, a non-qualified, employer-funded defined contribution retirement plan which was terminated in fiscal 2005.
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