Revenue Details (Details) - 9 months ended Oct. 31, 2018 $ in Thousands	Divisions	USD ($)	segment
Revenue from Contract with Customer [Abstract]
Number of operating divisions	3		3
Increase (Decrease) in Cost in Excess of Billing on Uncompleted Contract		$ (503)
Increase (Decrease) in Billing in Excess of Cost of Earnings		(345)
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://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&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