COMMITMENTS - Warranties (Details)	12 Months Ended
Jan. 31, 2022
Minimum [Member]
Warranty period	P9M
Maximum [Member]
Warranty period	twenty-four months

Represents the information pertaining to warranty provisions covering defects in equipment, materials etc.. after the completion of construction.

No definition available.

Name:	agx_WarrantyPeriodForConstructionContracts
Namespace Prefix:	agx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration