Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Allowance for doubtful accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Beginning Balance	$ 200	$ 275	$ 350
Valuation Allowances and Reserves, Charged to (Reduced from) Expenses	115	3	75
Valuation Allowances and Reserves, Deductions from Reserves	115	78	150
Valuation Allowances and Reserves, Ending Balance	200	200	275
Warranty reserve
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Beginning Balance	1,000	1,000	1,400
Valuation Allowances and Reserves, Charged to (Reduced from) Expenses	442	380	140
Valuation Allowances and Reserves, Deductions from Reserves	492	380	540
Valuation Allowances and Reserves, Ending Balance	950	1,000	1,000
Product, general, workers’ compensation and automobile liability reserves
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Beginning Balance	2,425	2,985	2,915
Valuation Allowances and Reserves, Charged to (Reduced from) Expenses	0	0	70
Valuation Allowances and Reserves, Deductions from Reserves	295	560	0
Valuation Allowances and Reserves, Ending Balance	2,130	2,425	2,985
Deferred tax valuation allowance
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Beginning Balance	24,210	24,601	22,859
Valuation Allowances and Reserves, Charged to (Reduced from) Expenses	2,189	0	1,742
Valuation Allowances and Reserves, Deductions from Reserves	0	391	0
Valuation Allowances and Reserves, Ending Balance	$ 26,399	$ 24,210	$ 24,601

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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