Activity of Goodwill by Reportable Operating Segment (Detail) (USD $)	12 Months Ended
	Sep. 27, 2013	Sep. 28, 2012
Goodwill [Line Items]
Balance, beginning	$ 222,242,000	$ 212,500,000
Acquisition of businesses		12,400,000
Foreign currency translation adjustments	3,100,000	(2,700,000)
Balance, ending	225,335,000	222,242,000
Oncology Systems
Goodwill [Line Items]
Balance, beginning	132,000,000	130,500,000
Acquisition of businesses		1,500,000
Foreign currency translation adjustments
Balance, ending	132,000,000	132,000,000
X-Ray Products
Goodwill [Line Items]
Balance, beginning	17,000,000	6,100,000
Acquisition of businesses		10,900,000
Foreign currency translation adjustments
Balance, ending	17,000,000	17,000,000
Other
Goodwill [Line Items]
Balance, beginning	73,200,000	75,900,000
Acquisition of businesses
Foreign currency translation adjustments	3,100,000	(2,700,000)
Balance, ending	$ 76,300,000	$ 73,200,000