XML 29 R61.htm IDEA: XBRL DOCUMENT
v3.3.1.900

MAJOR CUSTOMERS - Additional Information (Details) - Customer Concentration Risk [Member] - customer | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2015 | Oct. 31, 2014 | Oct. 31, 2015 | Oct. 31, 2014 | Jan. 31, 2015
Revenue [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of major power industry service customers | 2 | 3 | 2 | 3 |
Accounts Receivable [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of major power industry service customers |  |  | 2 |  | 2
Major Customer One [Member] | Revenue [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of consolidated net revenues accounted by major customers or segments | 36.00% | 44.00% | 42.00% | 45.00% |
Major Customer One [Member] | Accounts Receivable [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of consolidated accounts receivable accounted by major customer |  |  | 42.00% |  | 50.00%
Major Customer Two [Member] | Revenue [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of consolidated net revenues accounted by major customers or segments | 36.00% | 44.00% | 41.00% | 39.00% |
Major Customer Two [Member] | Accounts Receivable [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of consolidated accounts receivable accounted by major customer |  |  | 41.00% |  | 45.00%
Major Customer Three [Member] | Revenue [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of consolidated net revenues accounted by major customers or segments | 10.00% | 10.00% |  | 14.00% |

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_CustomerConcentrationRiskMember
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_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
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: |