XML 65 R53.htm IDEA: XBRL DOCUMENT
v3.21.1

CUSTOMER CONCENTRATIONS (Details) - customer | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Jan. 31, 2021
Major Customer One | Accounts Receivable |  |  |
Customer Concentrations |  |  |
Percentage of consolidated accounts receivable accounted by major customer | 23.00% |  |
Customer Concentration Risk | Accounts Receivable |  |  |
Customer Concentrations |  |  |
Number of customers | 2 |  | 3
Customer Concentration Risk | Contract Asset |  |  |
Customer Concentrations |  |  |
Number of customers | 1 |  | 2
Customer Concentration Risk | Major Customer One | Accounts Receivable |  |  |
Customer Concentrations |  |  |
Percentage of consolidated accounts receivable accounted by major customer |  |  | 26.00%
Customer Concentration Risk | Major Customer One | Contract Asset |  |  |
Customer Concentrations |  |  |
Percentage of major customers or segments | 65.00% |  | 64.00%
Customer Concentration Risk | Major Customer Two | Accounts Receivable |  |  |
Customer Concentrations |  |  |
Percentage of consolidated accounts receivable accounted by major customer |  |  | 11.00%
Customer Concentration Risk | Major Customer Two | Contract Asset |  |  |
Customer Concentrations |  |  |
Percentage of major customers or segments |  |  | 12.00%
Customer Concentration Risk | Major Customer Three | Accounts Receivable |  |  |
Customer Concentrations |  |  |
Percentage of consolidated accounts receivable accounted by major customer |  |  | 11.00%
Power Services | Product Concentration Risk | Revenue |  |  |
Customer Concentrations |  |  |
Percentage of major customers or segments | 77.00% | 81.00% |
Power Services | Customer Concentration Risk | Revenue |  |  |
Customer Concentrations |  |  |
Number of customers | 1 | 2 |
Power Services | Customer Concentration Risk | Major Customer One | Revenue |  |  |
Customer Concentrations |  |  |
Percentage of major customers or segments | 68.00% | 61.00% |
Power Services | Customer Concentration Risk | Major Customer Two | Revenue |  |  |
Customer Concentrations |  |  |
Percentage of major customers or segments |  | 17.00% |
Industry services | Product Concentration Risk | Revenue |  |  |
Customer Concentrations |  |  |
Percentage of major customers or segments | 21.00% | 16.00% |

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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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

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

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

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

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: | srt_ProductOrServiceAxis=agx_IndustryServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |