XML 81 R65.htm IDEA: XBRL DOCUMENT
v3.8.0.1

CONCENTRATIONS OF REVENUES AND ACCOUNTS RECEIVABLE (Details) - customer | 12 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Accounts Receivable |  |  |
Major Customers |  |  |
Number of major power industry service customers | 4 | 4 |
Major Customer One | Accounts Receivable |  |  |
Major Customers |  |  |
Percentage of consolidated accounts receivable accounted by major customer | 20.00% | 18.00% |
Major Customer Two | Accounts Receivable |  |  |
Major Customers |  |  |
Percentage of consolidated accounts receivable accounted by major customer | 20.00% | 17.00% |
Major Customer Three | Accounts Receivable |  |  |
Major Customers |  |  |
Percentage of consolidated accounts receivable accounted by major customer | 15.00% | 17.00% |
Major Customer Four | Accounts Receivable |  |  |
Major Customers |  |  |
Percentage of consolidated accounts receivable accounted by major customer | 14.00% | 11.00% |
Power Services | Revenue |  |  |
Major Customers |  |  |
Percentage of major customers or segments | 91.00% | 87.00% | 94.00%
Number of major power industry service customers | 4 | 5 | 2
Power Services | Major Customer One | Revenue |  |  |
Major Customers |  |  |
Percentage of major customers or segments | 29.00% | 20.00% | 38.00%
Power Services | Major Customer Two | Revenue |  |  |
Major Customers |  |  |
Percentage of major customers or segments | 26.00% | 18.00% | 35.00%
Power Services | Major Customer Three | Revenue |  |  |
Major Customers |  |  |
Percentage of major customers or segments | 15.00% | 17.00% |
Power Services | Major Customer Four | Revenue |  |  |
Major Customers |  |  |
Percentage of major customers or segments | 14.00% | 14.00% |
Power Services | Major Customer Five | Revenue |  |  |
Major Customers |  |  |
Percentage of major customers or segments |  | 10.00% |

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=84177426&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=77997519&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=84177426&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=77997519&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_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: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=agx_MajorCustomerFourMember
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: |

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_MajorCustomerFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |