STOCKHOLDERS' EQUITY - Schedule of Amounts Reclassified Out of Other Comprehensive Earnings (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Reclassification Adjustment Out Of Accumulated Comprehensive Income [Line Items]
Revenues	$ 741.0	$ 678.5
Operating earnings	111.7	121.6
Unrealized loss on defined benefit pension and post-retirement benefit plans
Reclassification Adjustment Out Of Accumulated Comprehensive Income [Line Items]
Other income (expense), net	(0.4)	(0.4)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Comprehensive Income [Line Items]
Operating earnings	(0.4)	(0.3)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gain on cash flow hedging instruments
Reclassification Adjustment Out Of Accumulated Comprehensive Income [Line Items]
Revenues	$ 0.0	$ 0.1