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LEGAL CONTINGENCIES - Additional Information (Details) - USD ($) | 1 Months Ended |
--- | --- | ---
May. 31, 2015 | Mar. 31, 2008 | Jan. 31, 2015
Loss Contingencies [Line Items] |  |  |
Payment received from proceeds deposited with bankruptcy court | $ 1,600,000 |  |
GPS [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
GPS mechanics lien against Nebraska project |  | $ 23,800,000 |
Net proceeds held by the bankruptcy court |  |  | $ 5,500,000
Payment received from proceeds deposited with bankruptcy court | $ 1,600,000 |  |

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- Definition Bankruptcy claims amount of claims retained by court. + References No definition available. + Details
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Namespace Prefix: | agx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the amount of a mechanics lien filed by the entity. + References No definition available. + Details
Name: | agx_MechanicsLienFiledAmount
Namespace Prefix: | agx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=agx_GemmaPowerSystemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |