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Cash, Cash Equivalents and Restricted Cash (Details) (USD $)	9 Months Ended
	Oct. 31, 2011	Oct. 31, 2012
Cash Cash Equivalents and Restricted Cash (Textual) [Abstract]
Restricted cash released	$ 1,243,000
Minimum percentage of cash and cash equivalents invested in U.S. Treasury obligations and repurchase agreements		80.00%

X

- Details

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

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- Definition

Minimum percentage of investment in specified assets.

+ References

No definition available.

+ Details

Name:	agx_MinimumPercentageOfInvestmentInSpecifiedAssets
Namespace Prefix:	agx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- 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