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FINANCING ARRANGEMENTS (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Apr. 30, 2021 | Jan. 31, 2021
Financing Arrangements |  |  |
Amount of an outstanding letter of credit issued by Bank in support of project development activities and deposited with the Bank as collateral | $ 3.4 | $ 3.4 | $ 3.4
London Interbank Offered Rate (LIBOR) |  |  |
Financing Arrangements |  |  |
Interest rate margin on referred rate |  | 2.00% |
Revolving Credit Facility |  |  |
Financing Arrangements |  |  |
Additional commitment amount | $ 10.0 |  |
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |
Financing Arrangements |  |  |
Variable rate | 30-day LIBOR |  |
Interest rate margin on referred rate | 1.60% |  | 2.00%
Revolving Credit Facility | Expires on May 31, 2024 |  |  |
Financing Arrangements |  |  |
Borrowing available under financing arrangements | $ 50.0 | $ 50.0 |
Letter of Credit |  |  |
Financing Arrangements |  |  |
Letters of credit outstanding amount | $ 1.8 | $ 1.8 |

X
- Definition This amount represents the amount of an outstanding letter of credit issued by Bank in support of project development activities and deposited with the Bank as collateral. + References No definition available. + Details
Name: | agx_AmountOutstandingLetterOfCreditIssuedByBankInSupportOfProjectDevelopmentActivitiesAndDepositedInBankAsCollateral
Namespace Prefix: | agx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount. + References No definition available. + Details
Name: | agx_LineOfCreditFacilityContingentIncreaseAdditionalBorrowingCapacity
Namespace Prefix: | agx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=agx_LettersOfCreditExpireOnMay312024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |