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v3.20.1

COMMITMENTS - Warranties (Details) | 12 Months Ended
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Jan. 31, 2020
Minimum |
Warranty period | 9 months
Maximum |
Warranty period | 24 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: |