Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 5,594us-gaap_Goodwill	$ 4,320us-gaap_Goodwill	$ 4,320us-gaap_Goodwill
Gross Carrying Amount	15,261	6,563
Accumulated Amortization	(4,430)	(3,362)
Net Carrying Amount	10,831us-gaap_FiniteLivedIntangibleAssetsNet	3,201us-gaap_FiniteLivedIntangibleAssetsNet	3,989us-gaap_FiniteLivedIntangibleAssetsNet
Proprietary Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	7 years 9 months 18 days
Gross Carrying Amount	6,121	3,577
Accumulated Amortization	(2,240)	(1,900)
Net Carrying Amount	3,881	1,677
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	5 years 9 months 18 days
Gross Carrying Amount	6,613	2,159
Accumulated Amortization	(1,583)	(1,057)
Net Carrying Amount	5,030	1,102
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	6 years 7 months 6 days
Gross Carrying Amount	2,243	650
Accumulated Amortization	(505)	(318)
Net Carrying Amount	1,738	332
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	6 years 9 months 18 days
Gross Carrying Amount	284	177
Accumulated Amortization	(102)	(87)
Net Carrying Amount	$ 182	$ 90

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=14024403&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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