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Other Intangible Assets - Intangible Assets (Detail) (USD $) | 3 Months Ended |
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Apr. 30, 2015 | Jan. 31, 2015
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Intangible Assets Gross Excluding Goodwill | $ 3,824,000 us-gaap_IntangibleAssetsGrossExcludingGoodwill |
Trade name - GPS, Accumulated Amortization | 2,039,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Intangible assets, Net Amount | 1,785,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | 1,845,000 us-gaap_IntangibleAssetsNetExcludingGoodwill
Trade Name [Member] | SMC [Member] |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Trade name - SMC, Estimated Useful Life | Indefinite |
Trade name - SMC, Net Amount | 181,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / dei_LegalEntityAxis = agx_SouthernMarylandCableMember | 181,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / dei_LegalEntityAxis = agx_SouthernMarylandCableMember
Trade name - SMC, Gross Carrying Amount | 181,000 agx_IndefiniteLivedIntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / dei_LegalEntityAxis = agx_SouthernMarylandCableMember |
Trade Name [Member] | GPS [Member] |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Trade name - GPS, Estimated Useful Life | 15 years |
Trade name - GPS, Gross Carrying Amount | 3,643,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / dei_LegalEntityAxis = agx_GemmaPowerSystemsMember |
Trade name - GPS, Accumulated Amortization | 2,039,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / dei_LegalEntityAxis = agx_GemmaPowerSystemsMember |
Trade name - GPS, Net Amount | $ 1,604,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / dei_LegalEntityAxis = agx_GemmaPowerSystemsMember | $ 1,664,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / dei_LegalEntityAxis = agx_GemmaPowerSystemsMember

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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=26713463&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=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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