XML 65 R53.htm IDEA: XBRL DOCUMENT
v3.5.0.2

CONCENTRATION OF REVENUES (Details) - customer | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2016 | Jul. 31, 2015 | Jan. 31, 2016
Product Concentration Risk | Revenue |  |  |  |  |
Major Customers |  |  |  |  |
Number of major power industry service customers | 5 | 2 | 5 | 2 |
Product Concentration Risk | Major Customer One | Revenue |  |  |  |  |
Major Customers |  |  |  |  |
Percentage of major customers or segments | 17.00% | 46.00% | 17.00% | 46.00% |
Product Concentration Risk | Major Customer Two | Revenue |  |  |  |  |
Major Customers |  |  |  |  |
Percentage of major customers or segments | 17.00% | 44.00% | 16.00% | 45.00% |
Product Concentration Risk | Major Customer Three | Revenue |  |  |  |  |
Major Customers |  |  |  |  |
Percentage of major customers or segments | 16.00% |  | 14.00% |  |
Product Concentration Risk | Major Customer Four | Revenue |  |  |  |  |
Major Customers |  |  |  |  |
Percentage of major customers or segments | 14.00% |  | 13.00% |  |
Product Concentration Risk | Major Customer Five | Revenue |  |  |  |  |
Major Customers |  |  |  |  |
Percentage of major customers or segments | 13.00% |  | 13.00% |  |
Customer Concentration Risk | Accounts Receivable |  |  |  |  |
Major Customers |  |  |  |  |
Number of major power industry service customers |  |  | 3 |  | 2
Customer Concentration Risk | Major Customer One | Accounts Receivable |  |  |  |  |
Major Customers |  |  |  |  |
Percentage of consolidated accounts receivable accounted by major customer |  |  | 14.00% |  | 27.00%
Customer Concentration Risk | Major Customer Two | Accounts Receivable |  |  |  |  |
Major Customers |  |  |  |  |
Percentage of consolidated accounts receivable accounted by major customer |  |  | 13.00% |  | 27.00%
Customer Concentration Risk | Major Customer Three | Accounts Receivable |  |  |  |  |
Major Customers |  |  |  |  |
Percentage of consolidated accounts receivable accounted by major customer |  |  | 10.00% |  |
Power Industry Services | Customer Concentration Risk | Revenue |  |  |  |  |
Major Customers |  |  |  |  |
Percentage of major customers or segments | 88.00% | 96.00% | 86.00% | 96.00% |

X
- Definition Number of major customers. + References No definition available. + Details
Name: | agx_NumberOfMajorCustomers
Namespace Prefix: | agx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of accounts receivable attributable to major customer. + References No definition available. + Details
Name: | agx_PercentageOfAccountsReceivableAttributableToMajorCustomer
Namespace Prefix: | agx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_ProductConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=agx_MajorCustomerOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=agx_MajorCustomerTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=agx_MajorCustomerThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=agx_MajorCustomerFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=agx_MajorCustomerFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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