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Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Warranty claim activity
Beginning balance	$ 950	$ 1,000	$ 950	$ 1,000
Provision	112	83	193	218
Costs incurred	(62)	(83)	(143)	(218)
Ending balance	$ 1,000	$ 1,000	$ 1,000	$ 1,000
Minimum [Member]
Warranty [Line Items]
Product warranty period			5 years
Maximum [Member]
Warranty [Line Items]
Product warranty period				10 years

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 460



-SubTopic 10



-Section 50



-Paragraph 8



-Subparagraph ((c)(5))



-URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.15(5))



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 460



-SubTopic 10



-Section 50



-Paragraph 8



-Subparagraph ((c)(3))



-URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249

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X

- Definition

The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 460



-SubTopic 10



-Section 50



-Paragraph 8



-Subparagraph ((c)(3,4))



-URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249



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-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 28



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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X

- Definition

Product warranty.

+ References

No definition available.

+ Details

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X

- Definition

Warranty [Line Items]

+ References

No definition available.

+ Details

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