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Costs Estimated Earnings and Billings on Uncompleted Contracts (Details Textual) (USD $) | Jul. 31, 2013
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Costs, Estimated Earnings and Billings on Uncompleted Contracts (Textual) [Abstract] |
Amount of unapproved change orders | $ 0

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- Definition Amount of unapproved change orders. + References No definition available. + Details
Name: | agx_AmountOfUnapprovedChangeOrders
Namespace Prefix: | agx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | agx_CostsEstimatedEarningsAndBillingsOnUncompletedContractsTextualAbstract
Namespace Prefix: | agx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration