XML 68 R48.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

INCOME TAXES - Income Tax Returns (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Oct. 31, 2019	Jan. 31, 2019
INCOME TAXES
Prepaid income taxes and income taxes receivable	$ 14.9	$ 19.5

X

- Definition

Represents the total amount of prepaid income taxes and income taxes receivable.

+ References

No definition available.

+ Details

Name:	agx_PrepaidIncomeTaxesAndIncomeTaxesReceivable
Namespace Prefix:	agx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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