Activity of Goodwill by Reportable Operating Segment (Detail) (USD $)	3 Months Ended
	Dec. 27, 2013
Goodwill [Line Items]
Balance, beginning	$ 225,335,000	[1]
Acquisition of business	600,000
Foreign currency translation adjustments	1,100,000
Balance, ending	226,955,000
Oncology Systems
Goodwill [Line Items]
Balance, beginning	132,000,000
Acquisition of business	600,000
Foreign currency translation adjustments	0
Balance, ending	132,600,000
X-Ray Products
Goodwill [Line Items]
Balance, beginning	17,000,000
Acquisition of business	0
Foreign currency translation adjustments	0
Balance, ending	17,000,000
Other
Goodwill [Line Items]
Balance, beginning	76,300,000
Acquisition of business	0
Foreign currency translation adjustments	1,100,000
Balance, ending	$ 77,400,000

[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.