Acquisition Amounts of Assets and Liabilities at Fair Value as of Acquisition Date (Detail) (Crossing Automation Inc, USD $) In Thousands, unless otherwise specified	Oct. 29, 2012
Business Acquisition [Line Items]
Accounts receivable	$ 5,356
Inventory	8,668
Prepaid expenses	610
Other current assets	1,358
Property, plant and equipment	2,270
Goodwill	26,453
Other long term assets	885
Accounts payable	(3,024)
Accrued liabilities	(5,172)
Deferred revenue	(319)
Other current liabilities	(388)
Other long-term liabilities	(8,232)
Total purchase price, net of cash acquired	59,005
Completed Technology
Business Acquisition [Line Items]
Identifiable intangible assets	10,530
Customer Relationships
Business Acquisition [Line Items]
Identifiable intangible assets	$ 20,010