Revenue from Contract with Customer (Details) $ in Thousands	12 Months Ended
Jan. 31, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Performance obligations more than one year	$ 0

Performance obligations more than one year: Performance obligations for contracts with customers with original expected durations of more than one year

No definition available.

Name:	ravn_Performanceobligationsmorethanoneyear
Namespace Prefix:	ravn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration