Correction of Immaterial Errors (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales	$ 64,981	$ 62,273	$ 149,100	$ 138,698
Gross profit	23,210	20,672	55,399	49,398
Selling, general and administrative expenses	$ 16,691	15,881	$ 43,763	42,076
Scenario, Adjustment [Member] \| Reclassification of Payments Made to Customers [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		379		676
Gross profit		379		676
Selling, general and administrative expenses		$ 379		$ 676

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

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- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=51677171&loc=d3e3636-108311

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