View Filing Data

Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Jan. 31, 2020	Mar. 28, 2020	Jul. 31, 2019
Document Information Line Items
Entity Registrant Name	REX AMERICAN RESOURCES Corp
Document Type	10-K
Current Fiscal Year End Date	--01-31
Entity Common Stock, Shares Outstanding		6,293,322
Entity Public Float			$ 416,091,198
Amendment Flag	false
Entity Central Index Key	0000744187
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Jan. 31, 2020
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Interactive Data Current	Yes

FAIR VALUE (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis - USD ($)
$ in Thousands

Jan. 31, 2020

Jan. 31, 2019

FAIR VALUE (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Investment in cooperative

^[1]

$ 341

$ 333

Forward purchase contracts liability

^[2]

$ 230

$ 22

[1]	The investment in cooperative is included in "Other assets" on the accompanying Consolidated Balance Sheets.
[2]	The forward purchase contracts liability is included in "Accrued expenses and other current liabilities" on the accompanying Consolidated Balance Sheets.

LEASES (Details) - Schedule of Future Minimum Rental Payments for Operating Leases $ in Thousands	Jan. 31, 2020 USD ($)
Schedule of Future Minimum Rental Payments for Operating Leases [Abstract]
Less: present value discount	$ 1,596

EMPLOYEE BENEFITS (Details) - Schedule of Non-Vested Restricted Stock Award Activity - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Schedule of Non-Vested Restricted Stock Award Activity [Abstract]
Weighted Average Grant Date Fair Value, Beginning of Period (in Dollars)	$ 2,935	$ 2,275	$ 1,386
Weighted Average Grant Date Fair Value, End of Period (in Dollars)	$ 2,193	$ 2,935	$ 2,275

INCOME TAXES (Details) - Schedule of Deferred Tax Assets and Liabilities - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Schedule of Deferred Tax Assets and Liabilities [Abstract]
Basis in pass through entities, including depreciation	$ (23,823)	$ (25,725)

INCOME TAXES (Details) - Schedule of Effective Income Tax Reconciliation - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Schedule of Effective Income Tax Reconciliation [Abstract]
Section 45 production tax credits	$ (9,002)	$ (21,144)	$ (11,522)
Tax Cuts and Jobs Act		272	(14,362)
Uncertain tax positions	$ (1,435)	$ 6,872	$ 361

INCOME TAXES (Details) - Schedule of Unrecognized Tax Benefits Roll Forward - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Schedule of Unrecognized Tax Benefits Roll Forward [Abstract]
Unrecognized tax benefits, beginning of year	$ 9,232	$ 2,325
Unrecognized tax benefits, end of year	$ 7,370	$ 9,232

Label

Element

Value

PaymentTerm

rex_PaymentTerm

5 days

PaymentTerm

rex_PaymentTerm

10 days

NonCashFinancingActivitiesEquityAwardsAccrued

rex_NonCashFinancingActivitiesEquityAwardsAccrued

$ 241,000

NonCashFinancingActivitiesEquityAwardsAccrued

rex_NonCashFinancingActivitiesEquityAwardsAccrued

487,000

NonCashFinancingActivitiesEquityAwardsAccrued

rex_NonCashFinancingActivitiesEquityAwardsAccrued

1,485,000

ProportionateShareOfRestrictedNetAssets

rex_ProportionateShareOfRestrictedNetAssets

$ 17,900,000

QuantityOfEthanolShipped

rex_QuantityOfEthanolShipped

424,600,000

IncreaseDecreaseInTotalAssetsAndTotalLiabilities

rex_IncreaseDecreaseInTotalAssetsAndTotalLiabilities

$ 20,900,000

ScheduleOfFinancialInformationForEquityMethodInvestmentsTableTextBlock

rex_ScheduleOfFinancialInformationForEquityMethodInvestmentsTableTextBlock

	Years Ended December 31,
	2019		2018		2017

Net sales and revenue	$	823,718	$	802,523	$	817,112
Gross profit	$	30,774	$	33,782	$	60,259
Income from continuing operations	$	13,502	$	14,893	$	32,243
Net income	$	13,502	$	14,893	$	32,243

NonCashFinancingActivitiesEquityAwardsIssued

rex_NonCashFinancingActivitiesEquityAwardsIssued

$ 487,000

NonCashFinancingActivitiesEquityAwardsIssued

rex_NonCashFinancingActivitiesEquityAwardsIssued

1,473,000

NonCashFinancingActivitiesEquityAwardsIssued

rex_NonCashFinancingActivitiesEquityAwardsIssued

$ 1,195,000

MaximumPercentageOfEquityOwnershipInterestWhichMayBeConsideredForEquityMethodOfAccounting

rex_MaximumPercentageOfEquityOwnershipInterestWhichMayBeConsideredForEquityMethodOfAccounting

20.00%

CommodityFuturesQuantity

rex_CommodityFuturesQuantity

3,700,000

CommodityFuturesQuantity

rex_CommodityFuturesQuantity

2,200,000

CommodityFuturesQuantity

rex_CommodityFuturesQuantity

2,000,000

AccruedExpensesRelatedPartiesCurrent

rex_AccruedExpensesRelatedPartiesCurrent

$ 500,000

AccruedExpensesRelatedPartiesCurrent

rex_AccruedExpensesRelatedPartiesCurrent

$ 1,600,000

PercentOfAccountsReceivable

rex_PercentOfAccountsReceivable

88.00%

PercentOfAccountsReceivable

rex_PercentOfAccountsReceivable

80.00%

DepreciationExpense

rex_DepreciationExpense

$ 20,182,000

DepreciationExpense

rex_DepreciationExpense

22,004,000

DepreciationExpense

rex_DepreciationExpense

20,037,000

DepreciationExpense

rex_DepreciationExpense

2,790,000

DepreciationExpense

rex_DepreciationExpense

2,784,000

DepreciationExpense

rex_DepreciationExpense

1,385,000

DepreciationExpense

rex_DepreciationExpense

35,000

DepreciationExpense

rex_DepreciationExpense

40,000

DepreciationExpense

rex_DepreciationExpense

40,000

DepreciationExpense

rex_DepreciationExpense

23,007,000

DepreciationExpense

rex_DepreciationExpense

24,828,000

DepreciationExpense

rex_DepreciationExpense

$ 21,462,000

ForwardPurchaseContractsQuantity

rex_ForwardPurchaseContractsQuantity

1,600,000

ForwardPurchaseContractsQuantity

rex_ForwardPurchaseContractsQuantity

1,300,000

GainOnDisposalOfRealEstateAndPropertyAndEquipment

rex_GainOnDisposalOfRealEstateAndPropertyAndEquipment

$ (104,000)

GainOnDisposalOfRealEstateAndPropertyAndEquipment

rex_GainOnDisposalOfRealEstateAndPropertyAndEquipment

(192,000)

NonCashInvestingActivitiesAccruedCapitalExpenditures

rex_NonCashInvestingActivitiesAccruedCapitalExpenditures

37,000

NonCashInvestingActivitiesAccruedCapitalExpenditures

rex_NonCashInvestingActivitiesAccruedCapitalExpenditures

$ 1,149,000

NumberOfOperatingEntities

rex_NumberOfOperatingEntities

NumberOfOperatingEntities

rex_NumberOfOperatingEntities

NumberOfOperatingEntities

rex_NumberOfOperatingEntities

InitialRightofuseAssetsAndLiabilities

rex_InitialRightofuseAssetsAndLiabilities

$ 20,918,000

NetSalesAndRevenueOfBusinessSegment

rex_NetSalesAndRevenueOfBusinessSegment

1,600,000

IncreaseDecreaseInProvisionForIncomeTaxes

rex_IncreaseDecreaseInProvisionForIncomeTaxes

(7,299,000)

CashAndCashEquivalents

rex_CashAndCashEquivalents

179,658,000

CashAndCashEquivalents

rex_CashAndCashEquivalents

188,531,000

CashAndCashEquivalents

rex_CashAndCashEquivalents

190,988,000

OperatingLeaseRightOfUseAssetAmortization

rex_OperatingLeaseRightOfUseAssetAmortization

$ 6,304,000

One Earth Energy [Member]

NumberOfInstallmentsPayable

rex_NumberOfInstallmentsPayable

120

InstallmentAmount

rex_InstallmentAmount

$ 36,500

InstallmentAmount

rex_InstallmentAmount

$ 29,250

LeaseExpirationPeriod

rex_LeaseExpirationPeriod

10 years

LeaseExpirationPeriod

rex_LeaseExpirationPeriod

15 years

One Earth Energy And Nu Gen Energy [Member]

QuantityOfNaturalGasUnderSalesCommitment

rex_QuantityOfNaturalGasUnderSalesCommitment

2,500,000

QuantityOfEthanolUnderSalesCommitment

rex_QuantityOfEthanolUnderSalesCommitment

28,600,000

ForwardPurchaseContractsQuantity

rex_ForwardPurchaseContractsQuantity

12,100,000

QuantityOfDistillersGrainsUnderSalesCommitment

rex_QuantityOfDistillersGrainsUnderSalesCommitment

107,000

QuantityOfNonFoodGradeCornOilUnderSalesCommitments

rex_QuantityOfNonFoodGradeCornOilUnderSalesCommitments

16,000,000

Refined Coal [Member]

FeesIncurredBySubsidiary

rex_FeesIncurredBySubsidiary

$ 4,231,000

FeesIncurredBySubsidiary

rex_FeesIncurredBySubsidiary

9,927,000

FeesIncurredBySubsidiary

rex_FeesIncurredBySubsidiary

$ 5,468,000