STOCKHOLDERS' EQUITY - Schedule of Amounts Reclassified Out of Other Comprehensive Earnings (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Reclassification Adjustment Out Of Accumulated Comprehensive Income [Line Items]
Revenues	$ 825.8	$ 709.1	$ 2,346.2	$ 2,117.5
Operating earnings	53.9	90.0	275.4	304.3
Unrealized loss on defined benefit pension and post-retirement benefit plans
Reclassification Adjustment Out Of Accumulated Comprehensive Income [Line Items]
Other income, net	(0.4)	(0.4)	(1.1)	(1.3)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Comprehensive Income [Line Items]
Operating earnings	(0.4)	(0.4)	(1.1)	(2.2)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized loss on cash flow hedging instruments
Reclassification Adjustment Out Of Accumulated Comprehensive Income [Line Items]
Revenues	$ 0.0	$ 0.0	$ 0.0	$ (0.9)