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Acquisitions of and Investments in Businesses and Technologies Pro forma consolidated condensed financial results of operations (Details) (Vista Research [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Vista Research [Member]
Business Acquisition [Line Items]
Pro forma net sales	$ 395,974	$ 328,361
Pro forma net income attributable to Raven Industries, Inc.	$ 49,907	$ 39,948
Pro forma earnings per common share:
Basic	$ 1.38	$ 1.10
Diluted	$ 1.37	$ 1.10

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details