XML 51 R42.htm IDEA: XBRL DOCUMENT v3.21.2

Derivative Financial Instruments (Details) bu in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2021 USD ($) bu	Jul. 31, 2020 USD ($)	Jul. 31, 2021 USD ($) bu	Jul. 31, 2020 USD ($)	Jan. 31, 2021 USD ($) bu l
Derivative Financial Instruments (Details) [Line Items]
Debt Instrument, Collateral Amount	$ 6,758,000		$ 6,758,000		$ 1,657,000
Gain (Loss) on Derivative Instruments, Net, Sales and Revenue	1,638,000	$ 298,000	2,764,000	$ 298,000
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 6,142,000	$ 4,613,000	$ 8,036,000	$ 1,758,000
Liability [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Forward Purchase Contracts, Quantity (in US Bushels) | bu	10.6		10.6		6.4
Short/Sell [Member] | Liability [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity | bu	8.6		8.6		6.9
Long/Buy [Member] | Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity	5.8		5.8		0

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	rex_GainLossOnDerivativeInstrumentsNetSalesAndRevenue
Namespace Prefix:	rex_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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=123599511&loc=d3e64711-112823

+ Details

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

X

- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959

+ Details

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

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_LiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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:

X

- Details

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

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_AssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: