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COMMITMENTS AND CONTINGENCIES - Accrued Product Warranty (Detail) - USD ($)
$ in Millions
9 Months Ended
Jun. 28, 2019
Jun. 29, 2018
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Accrued product warranty, at beginning of period $ 44.8 $ 41.3
Charged to cost of revenues 41.7 41.8
Actual product warranty expenditures (36.9) (41.6)
Accrued product warranty, at end of period $ 49.6 $ 41.5