Operating Results Information for each Business Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 27, 2013	Dec. 28, 2012
Segment Reporting Information [Line Items]
Revenues	$ 711,502	$ 678,398
Operating Earnings (Loss)	141,994	137,490
Operating Segments | Oncology Systems
Segment Reporting Information [Line Items]
Revenues	542,000	524,000
Operating Earnings (Loss)	121,000	120,000
Operating Segments | X-Ray Products
Segment Reporting Information [Line Items]
Revenues	145,000	133,000
Operating Earnings (Loss)	39,000	34,000
Operating Segments | Total reportable segments
Segment Reporting Information [Line Items]
Revenues	687,000	657,000
Operating Earnings (Loss)	160,000	154,000
Operating Segments | Other
Segment Reporting Information [Line Items]
Revenues	25,000	21,000
Operating Earnings (Loss)	(13,000)	(11,000)
Corporate
Segment Reporting Information [Line Items]
Operating Earnings (Loss)	$ (5,000)	$ (6,000)