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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014
Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 6,339 | $ 3,833 | $ 3,374
Charged to Costs and Expenses | 2,069 | 2,834 | 1,048
Charged to Other Accounts | 404 | (332) | (139)
Deductions Describe | (2,991) | 4 | (450)
Balance at End of Period | 5,821 | 6,339 | 3,833
Allowance for Obsolete Equipment and Inventory [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 750 | 1,032 | 1,073
Charged to Costs and Expenses |  | (60) | 164
Charged to Other Accounts | (58) | (151) | (15)
Deductions Describe | 208 | (71) | (190)
Balance at End of Period | $ 900 | $ 750 | $ 1,032

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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 -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 + Details
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