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Pension and Other Employee Benefits - Schedule of Reconciliation of Benefit Obligations, Plan Assets Funded Status (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Other Liabilities Disclosure [Abstract]      
Benefit obligation at beginning of year $ (10.9) $ (10.0) $ (9.7)
Service cost 0.0 0.0 0.0
Interest cost (0.1) (0.1) (0.2)
Plan participants’ contributions 0.0 0.0 0.0
Actuarial gain (loss) 0.5 (0.5) (1.0)
Foreign exchange gain (0.1) (0.7) 0.6
Benefits paid 0.3 0.4 0.3
Benefit obligation at end of year (10.3) (10.9) (10.0)
Plan assets 0.0 0.0 0.0
Benefit obligation at end of year $ (10.3) $ (10.9) $ (10.0)