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Accounts Receivable (Details Textual) (USD $) In Millions, unless otherwise specified			6 Months Ended
	Jul. 31, 2012	Jan. 31, 2012	Jul. 31, 2012 Maximum [Member]	Jul. 31, 2012 Minimum [Member]	Jul. 31, 2012 Construction Contracts Retainages [Member]	Jan. 31, 2012 Construction Contracts Retainages [Member]
Accounts Receivable (Textual) [Abstract]
Length of retention holding period			2 years	9 months
Allowance for doubtful accounts	$ 5.5	$ 5.5
Accounts receivable					$ 19.0	$ 9.8

X

- Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The length of time retainage amounts are held by project owners prior to payment to contractor.

+ References

No definition available.

+ Details

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Namespace Prefix:	agx_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 910

-SubTopic 310

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49370-109356



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3(c)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph c(1)

-Article 5

+ Details

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Balance Type:	debit
Period Type:	instant