Activity of Goodwill by Reportable Operating Segment (Detail) (USD $)	9 Months Ended
	Jun. 27, 2014
Goodwill [Line Items]
Balance, beginning	$ 225,335,000	[1]
Acquisition of businesses	10,400,000
Foreign currency translation adjustments	400,000
Balance, ending	236,130,000
Oncology Systems
Goodwill [Line Items]
Balance, beginning	132,000,000
Acquisition of businesses	10,400,000
Balance, ending	142,400,000
Imaging Components
Goodwill [Line Items]
Balance, beginning	33,200,000
Acquisition of businesses	0
Foreign currency translation adjustments	0
Balance, ending	33,200,000
Other
Goodwill [Line Items]
Balance, beginning	60,100,000
Foreign currency translation adjustments	400,000
Balance, ending	$ 60,500,000

[1] The condensed consolidated balance sheet as of September 27, 2013 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.