Acquisitions of and Investments in Businesses and Technologies (Details) (USD $)	12 Months Ended						1 Months Ended	12 Months Ended										1 Months Ended			1 Months Ended			12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2014 Maximum [Member]	Jan. 31, 2014 Minimum [Member]	Oct. 31, 2012 SST [Member]	Jan. 31, 2012 Vista Research [Member]	Jan. 31, 2013 Vista Research [Member]	Jan. 31, 2014 Vista Research [Member] Acquisition [Member]	Jan. 31, 2013 Vista Research [Member] Acquisition [Member]	Jan. 31, 2012 Vista Research [Member] Acquisition [Member]	Jan. 31, 2014 Vista Research [Member] Accrued Liabilities [Member]	Jan. 31, 2013 Vista Research [Member] Accrued Liabilities [Member]	Jan. 31, 2012 Vista Research [Member] Accrued Liabilities [Member]	Jan. 31, 2014 Vista Research [Member] Other Liabilities [Member]	Jan. 31, 2013 Vista Research [Member] Other Liabilities [Member]	Jan. 31, 2012 Vista Research [Member] Other Liabilities [Member]	Jan. 31, 2012 Vista Research [Member] Maximum [Member]	Jan. 31, 2012 Vista Research [Member] Maximum [Member] Employee Bonus Pool [Member]	Jan. 31, 2013 Vista Research [Member] Maximum [Member] Employee Bonus Pool [Member]	Jan. 31, 2012 Vista Research [Member] Minimum [Member]	Oct. 31, 2012 SST [Member]	Nov. 30, 2009 SST [Member]	Jan. 31, 2013 Ranchview [Member]	Dec. 31, 2009 Ranchview [Member]
Business Acquisition [Line Items]
Stock purchase price from business acquisition							$ 23,269,000
Cash paid for in connection with business combination	0	0	11,787,000				12,000,000
Liabilities assumed							2,869,000
Fair value of contingent consideration recognized at acquisition									3,347,000	3,071,000	8,400,000
Cash paid to settle outstanding contingent consideration	(353,000)	(8,367,000)	0					6,500,000																1,841,000
Business acquisition contingent consideration payments period																			7 years
Maximum amount of contingent consideration to be paid																				15,000,000					4,000,000
Acquisition-related contingent liability, current	890,000	712,000	3,266,000									890,000	712,000	3,068,000
Acquisition-related contingent liability, noncurrent	2,457,000	2,359,000	7,655,000												2,457,000	2,359,000	5,332,000
Goodwill							11,497,000
Other intangible assets related to business acquisition							7,810,000
Finite-lived intangible assets, useful life, minimum, years				20 years	3 years													10 years			6 years
Weighted average useful life							4 years 1 month 13 days
Net sales recognized							631,000
Net loss recognized							(125,000)
Percengate of voting interest acquired																						22.00%	20.00%
Outstanding common stock percentage						10.00%
Decrease of basis in net assets at acquisition																						525,000
Increase of basis in technology-related assets																						117,000
Increase of basis in goodwill																						408,000
Net impact to carrying value of the investment						0
Gain on acquisition-related contingent liability settlement	$ 0	$ 508,000	$ 0																					$ 508,000