Acquisitions Amounts of Assets and Liabilities at Fair Value as of Acquisition Date (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 01, 2014	Apr. 30, 2014	Sep. 30, 2014
Business Acquisition [Line Items]
Goodwill	$ 117,652				$ 109,501
Total purchase price, net of cash acquired	15,428	0
FluidX [Member]
Business Acquisition [Line Items]
Accounts receivable			1,980
Inventory			3,177
Prepaid and other current assets			213
Property, plant and equipment			101
Goodwill			7,850
Accounts payable			(2,079)
Accrued liabilities			(72)
Deferred revenue			(992)
Long-term deferred tax liabilities			(1,540)
Total purchase price, net of cash acquired			15,428
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