RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS (Details)	1 Months Ended
May 31, 2014 contract
Accounting Standards Update 2014-09 - Revenue from Contracts with Customers
Revenue Recognition
Number of active EPC contracts of GPS	4

Represents the number of contacts that the company entered with the customers.

No definition available.

Name:	agx_NumberOfActiveEpcContractsOfGps
Namespace Prefix:	agx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration