STOCKHOLDERS' EQUITY AND NONCONTROLLING INTERESTS - Noncontrolling interests (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2017	Apr. 01, 2016	Mar. 31, 2017	Apr. 01, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	[1]			$ 1,744.2
Net earnings attributable to noncontrolling interests		$ 0.1	$ 0.0	(0.5)	$ 0.0
Balance at end of period		1,292.6		1,292.6
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of period				10.3	0.0
Net earnings attributable to noncontrolling interests				0.1	0.1
Reclassification of noncontrolling interests in MeVis to redeemable noncontrolling interests				0.0	10.4
Transfer of redeemable noncontrolling interests in Mevis to Varex				(10.3)	0.0
Other				(0.1)	(0.2)
Balance at end of period		0.0	10.3	0.0	10.3
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period				3.7	14.7
Net earnings attributable to noncontrolling interests				0.4	(0.1)
Reclassification of noncontrolling interests in MeVis to redeemable noncontrolling interests				0.0	(10.4)
Transfer of redeemable noncontrolling interests in Mevis to Varex				0.0	0.0
Other				0.0	(0.5)
Balance at end of period		$ 4.1	$ 3.7	$ 4.1	$ 3.7

[1] The condensed consolidated balance sheet as of September 30, 2016 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.