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REVENUES FROM CONTRACTS WITH CUSTOMERS - Variable Consideration (Details) - USD ($) $ in Millions | Jan. 31, 2025 | Jan. 31, 2024
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REVENUES FROM CONTRACTS WITH CUSTOMERS |  |
Amounts of unpriced change orders included in transaction prices | 8.0 | 8.4

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- Definition Amounts of unpriced change orders included in transaction prices. + References No definition available. + Details
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Namespace Prefix: | agx_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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