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Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified | 9 Months Ended
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Oct. 31, 2014
Subsequent Event [Member] |
Subsequent Events (Details) [Line Items] |
Repayments of Debt | $ 33.5

X
- Details
Name: | rex_SubsequentEventsDetailsLineItems
Namespace Prefix: | rex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration