Activity of Goodwill by Reportable Operating Segment (Detail) (USD $)	9 Months Ended
	Jun. 28, 2013
Goodwill [Line Items]
Balance, beginning	$ 222,242,000	[1]
Foreign currency translation adjustments	700,000
Balance, ending	222,946,000
Oncology Systems
Goodwill [Line Items]
Balance, beginning	132,000,000
Foreign currency translation adjustments
Balance, ending	132,000,000
X Ray Products
Goodwill [Line Items]
Balance, beginning	17,000,000
Foreign currency translation adjustments
Balance, ending	17,000,000
Other
Goodwill [Line Items]
Balance, beginning	73,200,000
Foreign currency translation adjustments	700,000
Balance, ending	$ 73,900,000

[1] The condensed consolidated balance sheet as of September 28, 2012 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.