SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Oct. 02, 2017	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of annual net sales				75.00%	75.00%
Interest income on loans receivable		$ 2.5	$ 2.1	$ 5.0	$ 4.8
Capital expenditure unpaid liabilities incurred				3.3	2.3
Recognition of excess tax benefits		$ 1.5		1.9
Excess tax benefits from share-based payment arrangements			3.2	0.0	4.0
Payments classified as cash flows related to tax guidance				2.9	8.8
Accounting Standards Update 2015-07 | Other liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets			$ 43.1		43.1
Gavita Holdings B.V.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contingent consideration paid	$ 3.0			$ 3.0
Fafard & Brothers Ltd.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contingent consideration paid					6.7
Growing Media Acquisition, Canada [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contingent consideration paid					$ 6.5