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REVENUES FROM CONTRACT WITH CUSTOMERS - Variable Consideration (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Oct. 31, 2018	Oct. 31, 2018	Jan. 31, 2018
REVENUES FROM CONTRACT WITH CUSTOMERS
Amounts of unpriced change orders included in transaction prices	$ 10.6	$ 10.6	$ 9.3
Impact on revenues, changes in estimates of the costs-to-complete active contracts	$ 16.7	$ 29.7

X

- Definition

The amounts of unpriced change orders included in transaction prices that were used to determine revenues.

+ References

No definition available.

+ Details

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Namespace Prefix:	agx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration