Leases (Details)	Apr. 30, 2014
Leases [Abstract]
Number of Owned Properties Subject to Operating Lease	4

Number of owned properties subject to operating lease.

No definition available.

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