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Fair Value Measurements - Roll Forward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 26, 2021
Jun. 27, 2020
Jun. 26, 2021
Jun. 27, 2020
Fair Value Disclosures [Abstract]        
Beginning balance $ 71.7 $ 0.8 $ 81.8 $ 9.1
Contingent consideration recorded at acquisition 0.0 0.0 0.0 0.9
Fair value adjustments 0.0 0.0 (10.1) 0.4
Payments 0.0 0.0 0.0 (9.6)
Ending balance $ 71.7 $ 0.8 $ 71.7 $ 0.8