XML 56 R40.htm IDEA: XBRL DOCUMENT
v3.3.1.900

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment and Revenue Recognition (Details) | 12 Months Ended
--- | ---
Jan. 31, 2016 USD ($) category project
Liquidated Damages | Pending Litigation |
Summary of significant accounting policies |
The number of projects where the Company may be subject to liquidated damages claims | project | 1
Potential amount of damages sought by plaintiff at end of contract | $ 11,100,000
Potential maximum daily liquidated damages amount | $ 175,000
Power Industry Services |
Summary of significant accounting policies |
Number of categories | category | 2
Minimum |
Summary of significant accounting policies |
Estimated useful lives of the assets | 5 years
Minimum | Power Industry Services |
Summary of significant accounting policies |
Revenue recognition period | 3 months
Maximum |
Summary of significant accounting policies |
Estimated useful lives of the assets | 39 years
Maximum | Power Industry Services |
Summary of significant accounting policies |
Revenue recognition period | 3 years

X
- Definition The number of revenue categories. + References No definition available. + Details
Name: | agx_NumberOfCategories
Namespace Prefix: | agx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of projects where the Company may be subject to liquidated damages claims. + References No definition available. + Details
Name: | agx_PossibleLossContingencyDamagesSoughtNumberOfProjectsInvolvedInLiquidatedDamagesClaim
Namespace Prefix: | agx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value (monetary amount) of the award at the end of the contract the plaintiff could potentially seek in the legal matter. + References No definition available. + Details
Name: | agx_PossibleLossContingencyDamagesSoughtValueEndOfContract
Namespace Prefix: | agx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The potential maximum daily liquidated damages amount. + References No definition available. + Details
Name: | agx_PotentialMaximumDailyLiquidatedDamagesLossContingencyAmount
Namespace Prefix: | agx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Revenue recognition period. + References No definition available. + Details
Name: | agx_RevenueRecognitionPeriod
Namespace Prefix: | agx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
Name: | agx_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | agx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LitigationCaseAxis=agx_LiquidatedDamagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=agx_PowerIndustryServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |