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Leases - Operating and Finance Leases (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 30, 2023
USD ($)
Sep. 27, 2025
USD ($)
Sep. 28, 2024
USD ($)
Lease
Lessee, Lease, Description [Line Items]      
Operating lease cost   $ 33.3 $ 41.3
Finance lease cost - amortization of right-of-use assets   0.7 0.7
Finance lease cost - interest cost   0.7 0.8
Operating cash flows from finance leases   0.6 0.7
Operating cash flows from operating leases   31.3 26.1
Financing cash flows from finance leases   3.3 3.8
Total cash paid for amounts included in the measurement of lease liabilities   35.2 30.6
ROU assets arising from entering into new operating lease obligations   24.1 60.4
Right-of-use asset obtained in exchange for finance lease liability   $ 0.0 $ 0.0
MASSACHUSETTS      
Lessee, Lease, Description [Line Items]      
Number of leases renewed | Lease     2
MASSACHUSETTS | Lease One      
Lessee, Lease, Description [Line Items]      
Operating lease cost     $ 23.3
Term of contract     10 years
MASSACHUSETTS | Lease Two      
Lessee, Lease, Description [Line Items]      
Operating lease cost     $ 8.4
Term of contract     5 years
Mobidiag      
Lessee, Lease, Description [Line Items]      
Other asset impairment charges $ 12.5