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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Allowance for doubtful accounts |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Valuation Allowances and Reserves, Beginning Balance | $ 200 | $ 200 | $ 200
Valuation Allowances and Reserves, Charged to (Reduced from) Expenses | 110 | 141 | 115
Valuation Allowances and Reserves, Deductions from Reserves | 110 | 141 | 115
Valuation Allowances and Reserves, Ending Balance | 200 | 200 | 200
Warranty reserve |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Valuation Allowances and Reserves, Beginning Balance | 1,000 | 950 | 1,000
Valuation Allowances and Reserves, Charged to (Reduced from) Expenses | 415 | 375 | 442
Valuation Allowances and Reserves, Deductions from Reserves | 415 | 325 | 492
Valuation Allowances and Reserves, Ending Balance | 1,000 | 1,000 | 950
Product, general, workers’ compensation and automobile liability reserves |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Valuation Allowances and Reserves, Beginning Balance | 2,050 | 2,130 | 2,425
Valuation Allowances and Reserves, Charged to (Reduced from) Expenses | 777 | 975 | 204
Valuation Allowances and Reserves, Deductions from Reserves | 1,177 | 1,055 | 499
Valuation Allowances and Reserves, Ending Balance | 1,650 | 2,050 | 2,130
Deferred tax valuation allowance |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Valuation Allowances and Reserves, Beginning Balance | 21,906 | 26,399 | 24,210
Valuation Allowances and Reserves, Charged to (Reduced from) Expenses | 0 | 0 | 2,189
Valuation Allowances and Reserves, Deductions from Reserves | 21,391 | 4,493 | 0
Valuation Allowances and Reserves, Ending Balance | $ 515 | $ 21,906 | $ 26,399

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition 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. + References No definition available. + Details
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