NOTES RECEIVABLE AND ACCRUED INTEREST (Details)	Jan. 31, 2016 USD ($)
NOTES RECEIVABLE AND ACCRUED INTEREST
Notes receivable allowance for uncollectible amounts	$ 208,000

A valuation allowance for notes receivables due a company that are expected to be uncollectible.

No definition available.

Name:	agx_NotesReceivableAllowanceForDoubtfulAccountsReceivable
Namespace Prefix:	agx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant