Revenue Details (Details) $ in Thousands	3 Months Ended
Apr. 30, 2018 USD ($) segment
Revenue from Contract with Customer [Abstract]
Number of operating divisions \| segment	3
Increase (Decrease) in Cost in Excess of Billing on Uncompleted Contract	$ (395)
Increase (Decrease) in Billing in Excess of Cost of Earnings	(903)
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.

+ Details

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

- Definition

The increase (decrease) during the reporting period in the liability reflecting cash payments received before the related costs have been incurred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) in the asset reflecting the cost incurred on uncompleted contracts in excess of related billings.

+ References

+ Details

Name:	us-gaap_IncreaseDecreaseInCostInExcessOfBillingOnUncompletedContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration