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

X

- Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration