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COMMITMENTS - Warranties (Details)	12 Months Ended
	Jan. 31, 2021
Minimum
Warranty period	9 months
Maximum
Warranty period	twenty-four months

X

- Definition

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

+ References

No definition available.

+ Details

Name:	agx_WarrantyPeriodForConstructionContracts
Namespace Prefix:	agx_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: