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Intangible Assets - Fair Value of Acquired Identifiable Intangible Assets and Related Estimated Useful Lives (Detail) - USD ($) $ in Thousands | Jan. 31, 2017 | Jan. 31, 2016
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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

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References 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 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References 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 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References 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 + Details
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