STOCKHOLDERS' EQUITY - Schedule of Accumulated Other Comprehensive Earnings (Loss) and Related Tax Effects (Detail) - USD ($) $ in Millions	9 Months Ended
	Jun. 28, 2019		Jun. 29, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,588.7	[1]	$ 1,521.9
Balance at end of period	1,757.3		1,501.5
Net Unrealized Gains (Losses) Defined Benefit Pension and Post-Retirement Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(35.2)		(44.1)
Other comprehensive loss before reclassifications	0.0		0.0
Amounts reclassified out of other comprehensive earnings	1.1		1.3
Tax expense	(0.2)		(0.2)
Balance at end of period	(34.3)		(43.0)
Net Unrealized Losses Cash Flow Hedging Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	0.0		0.0
Other comprehensive loss before reclassifications	(0.3)		(0.9)
Amounts reclassified out of other comprehensive earnings	0.0		0.9
Tax expense	0.0		0.0
Balance at end of period	(0.3)		0.0
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(30.1)		(24.7)
Other comprehensive loss before reclassifications	(4.8)		(3.0)
Amounts reclassified out of other comprehensive earnings	0.0		0.0
Tax expense	0.0		0.0
Balance at end of period	(34.9)		(27.7)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(65.3)		(68.8)
Other comprehensive loss before reclassifications	(5.1)		(3.9)
Amounts reclassified out of other comprehensive earnings	1.1		2.2
Tax expense	(0.2)		(0.2)
Balance at end of period	$ (69.5)		$ (70.7)

[1] The condensed consolidated balance sheet as of September 28, 2018, was derived from audited financial statements as of that date, but does not include all disclosures required by accounting principles generally accepted in the United States of America.