SEGMENT INFORMATION - Operating Results Information for Each Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 01, 2016	Apr. 03, 2015	Apr. 01, 2016	Apr. 03, 2015
Segment Reporting Information [Line Items]
Revenues	$ 758,767	$ 759,406	$ 1,515,900	$ 1,497,260
Operating Earnings (Loss)	133,983	146,036	250,633	275,486
Corporate
Segment Reporting Information [Line Items]
Operating Earnings (Loss)	(8,600)	(7,200)	(20,000)	(31,400)
Operating Segments | Oncology Systems
Segment Reporting Information [Line Items]
Revenues	584,100	589,400	1,173,400	1,152,700
Operating Earnings (Loss)	129,500	125,900	244,700	252,000
Operating Segments | Imaging Components
Segment Reporting Information [Line Items]
Revenues	143,700	155,500	285,100	321,500
Operating Earnings (Loss)	25,700	40,000	50,900	81,200
Operating Segments | Total reportable segments
Segment Reporting Information [Line Items]
Revenues	727,800	744,900	1,458,500	1,474,200
Operating Earnings (Loss)	155,200	165,900	295,600	333,200
Operating Segments | Other
Segment Reporting Information [Line Items]
Revenues	31,000	14,500	57,400	23,100
Operating Earnings (Loss)	$ (12,700)	$ (12,700)	$ (25,000)	$ (26,300)