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CASH, CASH EQUIVALENTS AND INVESTMENTS - Concentration Risk (Details) | Jul. 31, 2025 | Jan. 31, 2025
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CASH, CASH EQUIVALENTS AND INVESTMENTS |  |
Percentage of cash and cash equivalents and investments held by foreign subsidiaries | 8.00% | 1.00%

X
- Definition Percentage of entity's cash and cash equivalents and investments held by foreign subsidiaries. + References No definition available. + Details
Name: | agx_PercentageOfCashAndCashEquivalentsAndInvestmentsHeldByForeignSubsidiaries
Namespace Prefix: | agx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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