Acquisitions Purchase Price Allocation Tables (Details) (USD $) In Thousands, unless otherwise specified	Jan. 10, 2011 InMoTx, Inc. [Member]	Jun. 25, 2010 MobileRobots [Member]
Business Acquisition [Line Items]
Current assets	$ 88	$ 1,196
Property and equipment	60	91
Inventory	370
Other long-term assets	14
Intangible assets	1,331	1,170
Goodwill	1,440	1,186
Total assets acquired	3,303	3,643
Current liabilities	681	515
Long-term debt	54	10
Total liabilities assumed	735	525
Net assets acquired	$ 2,568	$ 3,118