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: