XML 56 R47.htm IDEA: XBRL DOCUMENT v3.10.0.1

DERIVATIVE FINANCIAL INSTRUMENTS (Details) bu in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2018 USD ($) bu	Jul. 31, 2017 USD ($)	Jul. 31, 2018 USD ($) bu	Jul. 31, 2017 USD ($)	Jan. 31, 2018 bu
DERIVATIVE FINANCIAL INSTRUMENTS (Details) [Line Items]
Debt Instrument, Collateral Amount	$ 778,000		$ 778,000
Derivative, Loss on Derivative	$ (405,000)	$ 853,000
Derivative, Gain on Derivative			$ 160,000	$ 977,000
Corn [Member]
DERIVATIVE FINANCIAL INSTRUMENTS (Details) [Line Items]
Forward Purchase Contracts, Quantity (in US Bushels) | bu	11.5		11.5		11.7
Corn [Member] | Short/Sell [Member]
DERIVATIVE FINANCIAL INSTRUMENTS (Details) [Line Items]
Commodity Futures, Quantity (in US Bushels) | bu	4.9		4.9		2.5

X

- References

No definition available.

+ Details

Name:	rex_CommodityFuturesQuantity
Namespace Prefix:	rex_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	rex_DERIVATIVEFINANCIALINSTRUMENTSDetailsLineItems
Namespace Prefix:	rex_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	rex_ForwardPurchaseContractsQuantity
Namespace Prefix:	rex_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentCollateralAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

+ Details

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

X

- Definition

Amount of decrease in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

+ Details

Name:	us-gaap_DerivativeLossOnDerivative
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_TradingActivityByTypeAxis=rex_CornMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerDurationAxis=rex_ShortSellMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: