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REVENUES FROM CONTRACT WITH CUSTOMERS (Details) - USD ($) $ in Millions	Jan. 31, 2021	Jan. 31, 2020
REVENUES FROM CONTRACT WITH CUSTOMERS
Retained amounts by project owners	$ 36.8	$ 20.0
Amounts of unpriced change orders included in transaction prices	16.6	20.6

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- Definition

Amounts of unpriced change orders included in transaction prices.

+ References

No definition available.

+ Details

Name:	agx_NPricedChangeOrdersIncludedInTransactionPrices
Namespace Prefix:	agx_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

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- Definition

The amounts retained by project owners under construction contracts.

+ References

No definition available.

+ Details

Name:	agx_RetainedAmountUnderConstructionContracts
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_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration