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Cash, Cash Equivalents and Restricted Cash (Details Textual) (USD $)	6 Months Ended
	Jul. 31, 2011
Cash Cash Equivalents and Restricted Cash (Textual) [Abstract]
Restricted cash released	$ 1,243,000

X

- Details

Name:	agx_CashCashEquivalentsAndRestrictedCashTextualAbstract
Namespace Prefix:	agx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash released to GPS from escrowed project funds.

+ References

No definition available.

+ Details

Name:	agx_RestrictedCashReleased
Namespace Prefix:	agx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration