Intangible Assets - Fair Value of Acquired Identifiable Intangible Assets and Related Estimated Useful Lives (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,880	$ 6,880
Accumulated Amortization	(1,616)	(900)
Net Carrying Amount	5,264	5,980
Customer Contract Relationships [Member] \| Miltope [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,100	3,100
Accumulated Amortization	(1,108)	(758)
Net Carrying Amount	1,992	2,342
Customer Contract Relationships [Member] \| RITEC [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,830	2,830
Accumulated Amortization	(207)	(31)
Net Carrying Amount	2,623	2,799
Non-Competition Agreement [Member] \| RITEC [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	950	950
Accumulated Amortization	(301)	(111)
Net Carrying Amount	$ 649	$ 839

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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