SEGMENT INFORMATION - Operating Results Information for Each Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 30, 2016	Jan. 01, 2016
Segment Reporting Information [Line Items]
Revenues	$ 763.3	$ 757.1
Operating Earnings (Loss)	38.4	116.7
Corporate
Segment Reporting Information [Line Items]
Operating Earnings (Loss)	(72.1)	(11.4)
Operating Segments | Oncology Systems
Segment Reporting Information [Line Items]
Revenues	581.1	589.3
Operating Earnings (Loss)	137.4	115.2
Operating Segments | Imaging Components
Segment Reporting Information [Line Items]
Revenues	151.9	141.4
Operating Earnings (Loss)	21.8	25.2
Operating Segments | Total reportable segments
Segment Reporting Information [Line Items]
Revenues	733.0	730.7
Operating Earnings (Loss)	159.2	140.4
Operating Segments | Other
Segment Reporting Information [Line Items]
Revenues	30.3	26.4
Operating Earnings (Loss)	$ (48.7)	$ (12.3)