Acquisitions of and Investments in Businesses and Technologies (Details) (USD $)	12 Months Ended			0 Months Ended		1 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013	Nov. 03, 2014	May 01, 2014	Oct. 31, 2012	Jan. 31, 2012	Nov. 30, 2009
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability, Current	$ 1,375,000	$ 890,000	$ 712,000
Business Combination, Contingent Consideration, Liability, Noncurrent	3,631,000	2,457,000	2,359,000
Cash paid to settle outstanding contingent consideration	(533,000)	(353,000)	(8,367,000)
Gain on acquisition-related contingent liability settlement	0	0	508,000
Goodwill	52,148,000	22,274,000	22,274,000				22,274,000
SST [Member]
Business Acquisition [Line Items]
Outstanding common stock percentage						10.00%
Net impact to carrying value of the investment						0
Integra Plastics [Member]
Business Acquisition [Line Items]
Business Acquisition, Name of Acquired Entity				Integra Plastics, Inc.
Business Acquisition, Date of Acquisition Agreement				Nov. 03, 2014
Stock purchase price from business acquisition				48,200,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Fair Value Method				1,541,696
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned				39,252,000
Payments to Acquire Businesses, Gross				9,361,000
Goodwill				27,216,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount				0
Business acquisition-related debt, outstanding balance	0
Revenue of Acquiree since acquisition date	5,627,000
Income or (Loss) of Acquiree since Acquisition Date	(874,000)
SBG Innovatiie and affiliate [Member]
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement					May 01, 2014
Stock purchase price from business acquisition					5,000,000
Maximum amount of contingent consideration to be paid					2,500,000
Contingent Consideration Term in Years					10 years
Acquisition-related contingent liability, Total	1,432,000
Business Combination, Contingent Consideration, Liability, Current	236,000
Business Combination, Contingent Consideration, Liability, Noncurrent	1,196,000
Cash paid to settle outstanding contingent consideration	79,000
Goodwill					3,250,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount					0
Finite-lived Intangible Assets Acquired					2,104,000
Business acquisition-related debt, outstanding balance	0
Revenue of Acquiree since acquisition date	3,245,000
Income or (Loss) of Acquiree since Acquisition Date	152,000
SBG Innovatie [Member]
Business Acquisition [Line Items]
Business Acquisition, Name of Acquired Entity					SBG Innovatie BV
Navtronics [Member]
Business Acquisition [Line Items]
Business Acquisition, Name of Acquired Entity					Navtronics BVBA
Vista Research [Member]
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement	Jan. 06, 2012
Business acquisition contingent consideration payments period	7 years
Maximum amount of contingent consideration to be paid	15,000,000
Acquisition-related contingent liability, Total	2,989,000	3,347,000	3,071,000
Business Combination, Contingent Consideration, Liability, Current	554,000	890,000	712,000
Business Combination, Contingent Consideration, Liability, Noncurrent	2,435,000	2,457,000	2,359,000
Cash paid to settle outstanding contingent consideration	454,000	353,000	6,500,000
Ranchview [Member]
Business Acquisition [Line Items]
Cash paid to settle outstanding contingent consideration		1,841,000
Gain on acquisition-related contingent liability settlement		508,000
SST [Member]
Business Acquisition [Line Items]
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
Percengate of voting interest acquired						22.00%		20.00%
Customer Relationships [Member] | Integra Plastics [Member]
Business Acquisition [Line Items]
Weighted average useful life				12 years
Finite-lived Intangible Assets Acquired				10,000,000
Other Intangible Assets [Member] | Integra Plastics [Member]
Business Acquisition [Line Items]
Weighted average useful life				2 years
Finite-lived Intangible Assets Acquired				$ 200,000