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Major Customers - Additional Information (Detail) (Power Industry Services [Member], Customer Concentration Risk [Member]) | 3 Months Ended | 0 Months Ended
--- | --- | ---
Apr. 30, 2015 Customer | Apr. 30, 2014 Customer | Apr. 30, 2015 Customer | Jan. 31, 2015
Revenue, Major Customer [Line Items] |  |  |  |
Number of major power industry service customers | 2 agx_NumberOfMajorCustomers | 3 agx_NumberOfMajorCustomers |  |
Revenue [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of consolidated net revenue accounted by major customers | 97.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember | 97.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember |  |
Accounts Receivable [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Number of major power industry service customers |  |  | 2 agx_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember |
Major Customer One [Member] | Revenue [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of consolidated net revenue accounted by major customers | 47.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = agx_MajorCustomerOneMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember | 38.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = agx_MajorCustomerOneMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember |  |
Major Customer One [Member] | Accounts Receivable [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of consolidated accounts receivable accounted by major customer |  |  | 44.00%agx_PercentageOfAccountsReceivableAttributableToMajorCustomer / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = agx_MajorCustomerOneMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember | 50.00%agx_PercentageOfAccountsReceivableAttributableToMajorCustomer / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = agx_MajorCustomerOneMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember
Major Customer Two [Member] | Revenue [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of consolidated net revenue accounted by major customers | 45.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = agx_MajorCustomerTwoMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember | 35.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = agx_MajorCustomerTwoMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember |  |
Major Customer Two [Member] | Accounts Receivable [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of consolidated accounts receivable accounted by major customer |  |  | 43.00%agx_PercentageOfAccountsReceivableAttributableToMajorCustomer / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = agx_MajorCustomerTwoMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember | 45.00%agx_PercentageOfAccountsReceivableAttributableToMajorCustomer / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = agx_MajorCustomerTwoMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember
Major Customer Three [Member] | Revenue [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of consolidated net revenue accounted by major customers |  | 23.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = agx_MajorCustomerThreeMember / us-gaap_StatementBusinessSegmentsAxis = agx_PowerIndustryServicesMember |  |

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- Definition Number of major customers. + References No definition available. + Details
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- Definition Percentage of accounts receivable attributable to major customer. + References No definition available. + Details
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Namespace Prefix: | agx_
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- 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 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: 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=6927468&loc=d3e6404-108592 Reference 3: 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=35750535&loc=d3e13531-108611 Reference 4: 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=6927468&loc=d3e6351-108592 + Details
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- Details
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