Acquisitions of and Investments in Businesses and Technologies (Details) (USD $)	12 Months Ended			1 Months Ended		12 Months Ended		12 Months Ended								12 Months Ended	1 Months Ended		12 Months Ended	1 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012 Vista Research [Member]	Oct. 31, 2012 SST [Member]	Jan. 31, 2010 SST [Member]	Nov. 30, 2009 SST [Member]	Jan. 31, 2013 Ranchview [Member]	Dec. 31, 2009 Ranchview [Member]	Jan. 31, 2013 Acquisition [Member] Vista Research [Member]	Jan. 31, 2012 Acquisition [Member] Vista Research [Member]	Jan. 31, 2013 Accrued Liabilities [Member] Vista Research [Member]	Jan. 31, 2012 Accrued Liabilities [Member] Vista Research [Member]	Jan. 31, 2013 Other Liabilities [Member] Vista Research [Member]	Jan. 31, 2012 Other Liabilities [Member] Vista Research [Member]	Jan. 31, 2013 Maximum [Member]	Jan. 31, 2012 Maximum [Member] Vista Research [Member]	Jan. 31, 2012 Maximum [Member] Employee Bonus Pool [Member] Vista Research [Member]	Jan. 31, 2013 Minimum [Member]	Jan. 31, 2012 Minimum [Member] Vista Research [Member]	Oct. 31, 2012 SST [Member]
Business Acquisition [Line Items]
Equity Method Investment Treasury Stock Acquired Percentage																					10.00%
Stock purchase price from business acquisition				$ 23,269,000
Cash paid for in connection with business combination				12,000,000
Liabilities Assumed				2,869,000
Acquisition-related contingent consideration	712,000	3,266,000	263,000							3,071,000	8,400,000	712,000	3,068,000	2,359,000	5,332,000
Contingent consideration to be paid in connection with business combination				6,500,000					4,000,000
Business acquisition contingent consideration payments period																		7 years
Maximum amount of contingent consideration to be paid																		15,000,000
Goodwill				11,497,000
Intangible assets related to business acquisition				7,810,000
Finite-lived intangible assets, useful life, minimum, years																20 years	10 years		3 years	6 years
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life				4 years 1 month 13 days
Net sales from the date of acquisition				631,000
Operating Income (Loss)				(125,000)
Business Acquisition, Percentage of Voting Interests Acquired					22.00%		20.00%
Business Acquisition, Decrease Of Basis In Net Assets From Acquisition Date					525,000
Business Acquisition, Increase Of Basis In Technology Related Assets From Acquisition Date					117,000
Business Acquisition, Increase Of Basis In Goodwill From Acquisition Date					408,000
Equity Method Investment, Impact To Carrying Value Of Investment Due To Ownership Percentage Change																					0
Total purchase price						5,000,000
Cash paid to settle outstanding contingent consideration								1,841,000
Gain on acquisition-related contingent liability settlement	$ 508,000	$ 0	$ 0					$ 508,000