COMMITMENTS (Details) $ in Millions	Apr. 30, 2025 USD ($)
COMMITMENTS
Unsatisfied bonded performance obligations	$ 600.0
Outstanding amount of bonds covering other risks including warranty obligations	$ 45.7

The aggregate amount of bonds covering other risks including warranty obligations.

No definition available.

Name:	agx_BondsOutstandingCoveringOtherRisks
Namespace Prefix:	agx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant