SEGMENT INFORMATION - Operating Results Information for Each Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jan. 01, 2016	Jan. 02, 2015
Segment Reporting Information [Line Items]
Revenues	$ 757,133	$ 737,854
Operating Earnings (Loss)	116,650	129,450
Corporate
Segment Reporting Information [Line Items]
Operating Earnings (Loss)	(11,400)	(24,200)
Operating Segments | Oncology Systems
Segment Reporting Information [Line Items]
Revenues	589,300	563,300
Operating Earnings (Loss)	115,200	126,100
Operating Segments | Imaging Components
Segment Reporting Information [Line Items]
Revenues	141,400	166,000
Operating Earnings (Loss)	25,200	41,200
Operating Segments | Total reportable segments
Segment Reporting Information [Line Items]
Revenues	730,700	729,300
Operating Earnings (Loss)	140,400	167,300
Operating Segments | Other
Segment Reporting Information [Line Items]
Revenues	26,400	8,600
Operating Earnings (Loss)	$ (12,300)	$ (13,600)