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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 5,821 | $ 6,339 | $ 3,833
Charged to Costs and Expenses | 737 | 2,069 | 2,834
Charged to Other Accounts | (31) | 404 | (332)
Deductions Describe | (623) | (2,991) | 4
Balance at End of Period | 5,904 | 5,821 | 6,339
Allowance for Obsolete Equipment and Inventory [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 900 | 750 | 1,032
Charged to Costs and Expenses | 116 | 208 | (60)
Charged to Other Accounts | (41) | (58) | (151)
Deductions Describe | (23) |  | (71)
Balance at End of Period | $ 952 | $ 900 | $ 750

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- Definition Valuation allowances and reserves charged to cost and expense increase decrease. + References No definition available. + Details
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- Definition Valuation allowances and reserves charged to other accounts increase decrease. + References No definition available. + Details
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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 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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