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, 2016	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

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.

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=26713463&loc=d3e16265-109275

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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=56956791&loc=d3e4845-128472

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