Segment Information (Operating Results Information For Each Business Segment) (Details) (USD $)	3 Months Ended								12 Months Ended
	Sep. 30, 2011	Jul. 01, 2011	Apr. 01, 2011	Dec. 31, 2010	Oct. 01, 2010	Jul. 02, 2010	Apr. 02, 2010	Jan. 01, 2010	Sep. 30, 2011	Oct. 01, 2010	Oct. 02, 2009
Segment Reporting Information [Line Items]
Revenue	$ 719,000,000	$ 649,400,000	$ 648,400,000	$ 579,900,000	$ 652,100,000	$ 578,000,000	$ 585,600,000	$ 540,900,000	$ 2,596,666,000	$ 2,356,585,000	$ 2,214,060,000
Operating Earnings									588,451,000	534,202,000	474,146,000
Depreciation & Amortization									53,000,000	48,000,000	44,000,000
Capital Additions									71,000,000	52,000,000	86,000,000
Total Assets	2,498,761,000				2,323,952,000				2,498,761,000	2,323,952,000
Goodwill	212,452,000				208,451,000				212,452,000	208,451,000	210,300,000
Oncology Systems [Member]
Segment Reporting Information [Line Items]
Revenue									2,022,000,000	1,862,000,000	1,798,000,000
Operating Earnings									507,000,000	462,000,000	482,000,000
Depreciation & Amortization									19,000,000	19,000,000	18,000,000
Capital Additions									17,000,000	14,000,000	20,000,000
Total Assets	1,093,000,000				1,000,000,000				1,093,000,000	1,000,000,000	986,000,000
Goodwill	130,500,000				126,700,000				130,500,000	126,700,000	126,700,000
X-Ray Products [Member]
Segment Reporting Information [Line Items]
Revenue									469,000,000	403,000,000	331,000,000
Operating Earnings									118,000,000	100,000,000	82,000,000
Depreciation & Amortization									8,000,000	7,000,000	7,000,000
Capital Additions									7,000,000	6,000,000	5,000,000
Total Assets	268,000,000				186,000,000				268,000,000	186,000,000	154,000,000
Goodwill	6,100,000				4,500,000				6,100,000	4,500,000	2,700,000
Total Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue									2,491,000,000	2,265,000,000	2,129,000,000
Operating Earnings									625,000,000	562,000,000	564,000,000
Depreciation & Amortization									27,000,000	26,000,000	25,000,000
Capital Additions									24,000,000	20,000,000	25,000,000
Total Assets	1,361,000,000				1,186,000,000				1,361,000,000	1,186,000,000	1,140,000,000
Goodwill	136,000,000				131,000,000				136,000,000	131,000,000	129,000,000
Other [Member]
Segment Reporting Information [Line Items]
Revenue									106,000,000	92,000,000	85,000,000
Operating Earnings									(32,000,000)	(30,000,000)	(19,000,000)
Depreciation & Amortization									3,000,000	3,000,000	3,000,000
Capital Additions									13,000,000	7,000,000	3,000,000
Total Assets	239,000,000				215,000,000				239,000,000	215,000,000	200,000,000
Goodwill	75,900,000				77,300,000				75,900,000	77,300,000	80,900,000
Corporate [Member]
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Earnings									(5,000,000)	2,000,000	(71,000,000)
Depreciation & Amortization									23,000,000	19,000,000	16,000,000
Capital Additions									34,000,000	25,000,000	58,000,000
Total Assets	899,000,000				923,000,000				899,000,000	923,000,000	968,000,000
Goodwill	$ 0				$ 0				$ 0	$ 0	$ 0