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Acquisitions of and Investments in Businesses and Technologies Total purchase price allocated to the estimated fair values of assets acquired and liabilities assumed (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2009
Ranchview [Member]
Jan. 31, 2012
Vista Research [Member]
Nov. 30, 2009
Existing Technology [Member]
Ranchview [Member]
Jan. 31, 2012
Existing Technology [Member]
Vista Research [Member]
Jan. 31, 2012
Customer Relationships [Member]
Vista Research [Member]
Nov. 30, 2009
Other Intangible Assets [Member]
Ranchview [Member]
Jan. 31, 2012
Other Intangible Assets [Member]
Vista Research [Member]
Business Acquisition [Line Items]              
Cash   $ 320          
Accounts receivable   2,375          
Inventory   264          
Other current and long term assets   3,342          
Property, plant, and equipment, net   834          
Goodwill 2,734 11,497          
Intangible assets related to business acquisition   7,810 900 4,300 3,260 175 250
Other intangibles   7,810 900 4,300 3,260 175 250
Current liabilities   (3,023)          
Other liabilities   (150)          
Total purchase price $ 3,809 $ 23,269