Tabular disclosure of amortizable finite-lived intangible assets, in total and by major class, including the gross carrying amount and accumulated amortization, and indefinite-lived intangible assets not subject to amortization, excluding goodwill, in total and by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Name:	agx_ScheduleOfFiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassTableTextBlock
Namespace Prefix:	agx_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration