Acquisitions Amounts of Assets and Liabilities at Fair Value as of Acquisition Date (Detail) - USD ($) $ in Thousands			9 Months Ended
	Oct. 01, 2014	Apr. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014
Business Acquisition [Line Items]
Goodwill			$ 118,257		$ 109,501
Total purchase price, net of cash acquired			$ 17,257	$ 37,832
FluidX [Member]
Business Acquisition [Line Items]
Accounts receivable	$ 1,980
Inventory	2,857
Prepaid and other current assets	213
Property, plant and equipment	101
Goodwill	8,247
Accounts payable	(2,079)
Accrued liabilities	(72)
Deferred revenue	(992)
Long-term deferred tax liabilities	(1,540)
Total purchase price, net of cash acquired	15,505
FluidX [Member] | Completed Technology
Business Acquisition [Line Items]
Finite-lived intangibles	1,230
FluidX [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Finite-lived intangibles	750
FluidX [Member] | Customer Relationships
Business Acquisition [Line Items]
Finite-lived intangibles	$ 4,810
Dynamic Micro Systems
Business Acquisition [Line Items]
Accounts receivable		$ 15,262
Inventory		9,750
Prepaid and other current assets		2,727
Property, plant and equipment		2,049
Goodwill		11,939
Accounts payable		(10,393)
Accrued liabilities		(5,522)
Deferred revenue		(1,309)
Long-term deferred tax liabilities		(3,588)
Total purchase price, net of cash acquired		31,625
Dynamic Micro Systems | Completed Technology
Business Acquisition [Line Items]
Finite-lived intangibles		3,610
Dynamic Micro Systems | Customer Relationships
Business Acquisition [Line Items]
Finite-lived intangibles		$ 7,100