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Derivative Financial Instruments - Schedule of Sales (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Schedule Of Sales Abstract
Net sales	$ 201	$ 429	$ 218	$ 436
Cost of sales	$ 317	$ (6,180)	$ 2,285	$ (6,116)

X

- Definition

Cost of sales

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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X

- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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