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v3.20.1

SUBSEQUENT EVENTS (Details) - Subsequent Event |  | 1 Months Ended
--- | --- | ---
Mar. 24, 2020 | Mar. 31, 2020
SUBSEQUENT EVENT |  |
Increase in loss carryback period for certain losses |  | 5 years
Percentage of sub contact work completed | 90.00% |

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- Definition Represents the increase in loss carryback period for certain losses. + References No definition available. + Details
Name: | agx_IncreaseInLossCarrybackPeriodForCertainLosses
Namespace Prefix: | agx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of sub contact work completed in the project. + References No definition available. + Details
Name: | agx_PercentageOfSubContactWorkCompleted
Namespace Prefix: | agx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |