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Major Customers (Details) | 12 Months Ended
--- | ---
Jan. 31, 2013 Customers | Jan. 31, 2012 Customers
Major Customers (Textual) [Abstract] |  |
Number of major power industry service customers | 2 | 3
Power Industry Services [Member] |  |
Major Customers (Textual) [Abstract] |  |
Percentage of consolidated net revenue accounted for by major segment | 94.00% | 93.00%
Major Customer One [Member] | Power Industry Services [Member] |  |
Major Customers (Textual) [Abstract] |  |
Percentage of consolidated net revenue accounted by major customers | 56.00% | 43.00%
Major Customer Two [Member] | Power Industry Services [Member] |  |
Major Customers (Textual) [Abstract] |  |
Percentage of consolidated net revenue accounted by major customers | 18.00% | 30.00%
Major Customer Three [Member] | Power Industry Services [Member] |  |
Major Customers (Textual) [Abstract] |  |
Percentage of consolidated net revenue accounted by major customers |  | 12.00%

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- Definition Entity wide revenue major segment percentage. + References No definition available. + Details
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Namespace Prefix: | agx_
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Balance Type: | na
Period Type: | duration

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- Details
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- Definition Number of major customers. + References No definition available. + Details
Name: | agx_NumberOfMajorCustomers
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Period Type: | duration

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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