STOCKHOLDERS' EQUITY - Schedule of Amounts Reclassified Out of Other Comprehensive Earnings (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Mar. 29, 2019	Mar. 30, 2018
Reclassification Adjustment Out Of Accumulated Comprehensive Income [Line Items]
Revenues	$ 779.4	$ 729.9	$ 1,520.4	$ 1,408.4
Operating earnings	109.8	109.1	221.5	230.7
Unrealized loss on defined benefit pension and post-retirement benefit plans
Reclassification Adjustment Out Of Accumulated Comprehensive Income [Line Items]
Other income (expense), net	(0.3)	(0.5)	(0.7)	(0.9)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Comprehensive Income [Line Items]
Operating earnings	(0.3)	(1.5)	(0.7)	(1.8)
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	$ (1.0)	$ 0.0	$ (0.9)