Activity of Goodwill by Reportable Operating Segment (Detail) (USD $)	9 Months Ended
	Jun. 29, 2012
Goodwill
Balance at September 30, 2011	$ 212,452,000	[1]
Acquisition of businesses	15,000,000
Foreign currency translation adjustments	(3,400,000)
Balance at June 29, 2012	224,058,000
Oncology Systems
Goodwill
Balance at September 30, 2011	130,500,000
Acquisition of businesses	4,100,000
Foreign currency translation adjustments	0
Balance at June 29, 2012	134,600,000
X-Ray Products
Goodwill
Balance at September 30, 2011	6,100,000
Acquisition of businesses	10,900,000
Foreign currency translation adjustments	0
Balance at June 29, 2012	17,000,000
Other
Goodwill
Balance at September 30, 2011	75,900,000
Acquisition of businesses	0
Foreign currency translation adjustments	(3,400,000)
Balance at June 29, 2012	$ 72,500,000

[1] The condensed consolidated balance sheet as of September 30, 2011 was derived from audited financial statements as of that date, but does not include all disclosures required by accounting principles generally accepted in the United States of America.