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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
Sep. 25, 2021
Sep. 26, 2020
Lessee, Lease, Description [Line Items]    
Operating lease, right-of-use assets $ 83,600,000 $ 80,700,000
Operating lease liabilities (current) 26,800,000 23,500,000
Finance lease liabilities (current) $ 3,700,000 1,900,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other long-term liabilities  
Operating lease liabilities (non-current) $ 66,100,000 65,600,000
Finance lease liabilities (non-current) $ 22,800,000 $ 17,400,000
Operating leases, weighted average remaining lease term 4 years 11 months 12 days 5 years 6 months 29 days
Finance leases, weighted average remaining lease term 7 years 6 months 7 days 7 years 7 months 20 days
Operating leases, weighted average discount rate 1.60% 2.00%
Finance leases, weighted average discount rate 4.30% 5.10%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued expenses  
Other assets    
Lessee, Lease, Description [Line Items]    
Operating lease, right-of-use assets $ 83,600 $ 80,700
Accrued expenses    
Lessee, Lease, Description [Line Items]    
Operating lease liabilities (current) 26,800 23,500
Other long-term liabilities    
Lessee, Lease, Description [Line Items]    
Operating lease liabilities (non-current) 66,100 65,600
Finance lease obligations - short term    
Lessee, Lease, Description [Line Items]    
Finance lease liabilities (current) 3,700 1,900
Finance lease obligations - long term    
Lessee, Lease, Description [Line Items]    
Finance lease liabilities (current) 9,300  
Finance lease liabilities (non-current) $ 22,800 $ 17,400