Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 30, 2015	Jan. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 5,620us-gaap_Goodwill	$ 5,594us-gaap_Goodwill
Gross Carrying Amount	15,691	15,261
Accumulated Amortization	(4,975)	(4,430)
Net Carrying Amount	10,716us-gaap_FiniteLivedIntangibleAssetsNet	10,831us-gaap_FiniteLivedIntangibleAssetsNet
Proprietary Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	7 years 8 months 12 days
Gross Carrying Amount	6,285	6,121
Accumulated Amortization	(2,384)	(2,240)
Net Carrying Amount	3,901	3,881
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	5 years 7 months 6 days
Gross Carrying Amount	6,805	6,613
Accumulated Amortization	(1,873)	(1,583)
Net Carrying Amount	4,932	5,030
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	6 years 4 months 24 days
Gross Carrying Amount	2,306	2,243
Accumulated Amortization	(603)	(505)
Net Carrying Amount	1,703	1,738
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	6 years 6 months
Gross Carrying Amount	295	284
Accumulated Amortization	(115)	(102)
Net Carrying Amount	$ 180	$ 182

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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