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Acquisition - Fair Value of the Acquired Identifiable Intangible Assets and Related Estimated Useful Lives (Detail) - RITEC [Member] - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jan. 31, 2017 | Jun. 19, 2015
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Fair Value | $ 3,780 | $ 3,780
Customer Contract Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Fair Value | $ 2,830 |
Useful Life | 10 years |
Non-Competition Agreement [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Fair Value | $ 950 |
Useful Life | 5 years |

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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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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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