XML 50 R38.htm IDEA: XBRL DOCUMENT
v3.5.0.2

PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2016 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2016 | Jul. 31, 2015 | Jan. 31, 2016
Finite-Lived Intangible Assets |  |  |  |  |  |
Goodwill | $ 34,780 | $ 34,780 | $ 22,887 | $ 34,780 | $ 22,887 | $ 37,405
Impairment loss |  | 1,979 |  | 1,979 |  |
Accumulated amortization | $ 3,116 | 3,116 |  | 3,116 |  |
APC |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Impairment loss |  | 2,000 | $ 0 | 2,000 | $ 0 |
APC | Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Percentage of contract backlog suspended | 90.00% |  |  |  |  |
TRC |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Goodwill | $ 14,300 | 14,300 |  | 14,300 |  |
GPS |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Goodwill | 18,500 | 18,500 |  | 18,500 |  |
APC |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Goodwill | 2,000 | 2,000 |  | $ 2,000 |  |
Trade Name | GPS |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite-Lived Intangible Assets - Estimated Useful Life |  |  |  | 15 years |  |
Finite Lived Intangible Assets - Gross Carrying Amount | 3,643 | 3,643 |  | $ 3,643 |  |
Accumulated amortization | 2,343 | 2,343 |  | 2,343 |  |
Finite Lived Intangible Assets - Net Amount | 1,300 | 1,300 |  | $ 1,300 |  | 1,421
Process certifications | TRC |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite-Lived Intangible Assets - Estimated Useful Life |  |  |  | 7 years |  |
Finite Lived Intangible Assets - Gross Carrying Amount | 1,897 | 1,897 |  | $ 1,897 |  |
Accumulated amortization | 181 | 181 |  | 181 |  |
Finite Lived Intangible Assets - Net Amount | 1,716 | 1,716 |  | $ 1,716 |  | 1,852
Customer Relationships | TRC |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite-Lived Intangible Assets - Estimated Useful Life |  |  |  | 10 years |  |
Finite Lived Intangible Assets - Gross Carrying Amount | 916 | 916 |  | $ 916 |  |
Accumulated amortization | 61 | 61 |  | 61 |  |
Finite Lived Intangible Assets - Net Amount | 855 | 855 |  | $ 855 |  | 901
Customer Relationships | APC |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite-Lived Intangible Assets - Estimated Useful Life |  |  |  | 4 years |  |
Finite Lived Intangible Assets - Gross Carrying Amount | 430 | 430 |  | $ 430 |  |
Accumulated amortization | 274 | 274 |  | 274 |  |
Finite Lived Intangible Assets - Net Amount | 156 | 156 |  | 156 |  | 371
Other intangibles |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite Lived Intangible Assets - Gross Carrying Amount | 288 | 288 |  | 288 |  |
Accumulated amortization | 257 | 257 |  | 257 |  |
Finite Lived Intangible Assets - Net Amount | $ 31 | $ 31 |  | $ 31 |  | $ 119

X
- Definition Represents the percentage of contract backlog that was suspended. + References No definition available. + Details
Name: | agx_PercentageOfContractBacklogThroughSuspensionOfProject
Namespace Prefix: | agx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=agx_AtlanticProjectsCompanyLimitedMember
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_BusinessAcquisitionAxis=agx_RobertsCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=agx_GemmaPowerSystemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=agx_AtlanticProjectsCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ServiceMarksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OtherIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |