Business Combinations - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended			1 Months Ended			1 Months Ended
	Dec. 27, 2013	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012	Jul. 31, 2014 Transpire, Inc.	Jul. 31, 2014 Transpire, Inc. Oncology Systems Reporting Unit	Jul. 31, 2014 Transpire, Inc. Security and Inspection Products Reporting Unit	Apr. 30, 2014 Velocity Medical Solutions LLC	Apr. 30, 2012 InfiMed, Inc.	Jul. 31, 2014 Developed Technology Transpire, Inc.	Apr. 30, 2014 Developed Technology Velocity Medical Solutions LLC	Jul. 31, 2014 Customer Relationships Transpire, Inc.	Apr. 30, 2014 Customer Relationships Velocity Medical Solutions LLC	Jul. 31, 2014 Trade Name Transpire, Inc.	Apr. 30, 2014 Trade Name Velocity Medical Solutions LLC	Jul. 31, 2014 In-process Research and Development Transpire, Inc. Oncology Systems Reporting Unit
Business Acquisition [Line Items]
Total purchase price	$ 1,500,000				$ 19,300,000			$ 19,900,000	$ 20,800,000
Cash consideration					16,000,000			17,000,000	17,100,000
Contingent consideration liabilties		7,500,000	2,500,000		3,300,000			2,900,000	3,700,000
Allocated to amortizable intangible assets					10,700,000	8,000,000	2,700,000	10,600,000	5,400,000
Goodwill acquired		240,626,000	225,335,000	222,200,000	8,700,000	5,900,000	2,800,000	9,800,000	10,900,000
Intangible assets acquired					10,700,000
Amortizable intangible assets acquired					8,700,000
Net assumed liabilities					(100,000)			(500,000)
Amortization period for intangible assets										6 years	6 years	7 years	7 years	6 years	6 years
Research and development asset acquired fair value		2,000,000														2,000,000
Cash consideration held back								2,600,000
Net assets acquired									$ 4,500,000