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Other Assets (Details) - Schedule of Other Assets (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Jan. 31, 2015
Schedule of Other Assets [Abstract]
Deposits	$ 914us-gaap_DepositsAssetsNoncurrent	$ 914us-gaap_DepositsAssetsNoncurrent
Real estate taxes refundable	4,395rex_RealEstateTaxesRefundableNoncurrent	4,395rex_RealEstateTaxesRefundableNoncurrent
Other	846us-gaap_OtherAssetsMiscellaneousNoncurrent	1,057us-gaap_OtherAssetsMiscellaneousNoncurrent
Total	$ 6,155us-gaap_OtherAssetsNoncurrent	$ 6,366us-gaap_OtherAssetsNoncurrent

X

- Definition

Value of real estate taxes refundable non current as of the reporting date.

+ References

No definition available.

+ Details

Name:	rex_RealEstateTaxesRefundableNoncurrent
Namespace Prefix:	rex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Definition

Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- Definition

Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

+ References

No definition available.

+ Details

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

X

- Definition

Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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