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Leases (Details)	Jul. 31, 2014
Leases [Abstract]
Number of Owned Properties Subject to Operating Lease	5

X

- Definition

Number of owned properties subject to operating lease.

+ References

No definition available.

+ Details

Name:	rex_NumberOfOwnedPropertiesSubjectToOperatingLease
Namespace Prefix:	rex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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