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Stock-Based Compensation (Details) - Schedule of Non-Vested Stock Award Activity - $ / shares shares in Thousands, $ / shares in Thousands	3 Months Ended
	Apr. 30, 2016	Jan. 31, 2016
Schedule of Non-Vested Stock Award Activity [Abstract]
Non-Vested Shares	3,168	3,168
Weighted-Average Grant Date Fair Value	$ 200	$ 200
Weighted-Average Vesting Term	2 years

X

- Definition

Non-Vested, Weighted-Average Vesting Term

+ References

No definition available.

+ Details

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Namespace Prefix:	rex_
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Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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

X

- Definition

Number of non-vested options outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average grant-date fair value of non-vested options outstanding.

+ References

No definition available.

+ Details

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