Acquisitions of and Investments in Businesses and Technologies (Details) (Ranchview [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 30, 2011	Jan. 31, 2013
Ranchview [Member]
Business Acquisition [Line Items]
Cash paid to settle outstanding contingent consideration		$ 1,841
Gain on settlement of contingent consideration	$ 508

Business Acquisition, Contingent Consideration, Gain (Loss) On Settlement

No definition available.

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Namespace Prefix:	ravn_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration