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ACCOUNTS AND NOTES RECEIVABLE (Details) - USD ($) $ in Millions | Oct. 31, 2019 | Jan. 31, 2019
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ACCOUNTS AND NOTES RECEIVABLE |  |
Outstanding balances of accounts receivable and contract assets | $ 19.6 | $ 17.1

X
- Definition Amount of outstanding balances which includes accounts receivable and contract assets. + References No definition available. + Details
Name: | agx_InvoicesOutstandingBalanceIncludedInAccountsReceivableAndContractAssets
Namespace Prefix: | agx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration