Correction of Immaterial Errors (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales	$ 61,072	$ 53,042	$ 84,120	$ 76,425
Gross profit	23,996	20,696	32,190	28,726
Selling, general and administrative expenses	$ 16,055	14,620	$ 27,097	26,195
Scenario, Adjustment [Member] \| Reclassification of Payments Made to Customers [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		150		297
Gross profit		150		297
Selling, general and administrative expenses		$ 150		$ 297

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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