SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2019	Dec. 28, 2018	Sep. 29, 2018	Sep. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to retained earnings for adoption of new accounting guidance	$ (67.7)		$ (58.9)	$ (62.4)
Adjustment Due to ASC 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on retained earnings, net of tax		$ (4.1)
Adjustment to retained earnings for adoption of new accounting guidance			$ 3.5
Correction Of ASC 606 Adoption | Adjustment Due to ASC 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on retained earnings, net of tax	0.6
Adjustment to retained earnings for adoption of new accounting guidance	$ (0.6)