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Acquisitions of and Investments in Businesses and Technologies - Total purchase price allocated to the estimated fair values of assets acquired and liabilities assumed (Details) (USD $)
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Nov. 03, 2014
Business Acquisition [Line Items]          
Goodwill $ 52,148,000us-gaap_Goodwill $ 22,274,000us-gaap_Goodwill $ 22,274,000us-gaap_Goodwill $ 22,274,000us-gaap_Goodwill  
Integra Plastics [Member]          
Business Acquisition [Line Items]          
Cash         1,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Business Acquisition, Goodwill, Expected Tax Deductible Amount         0us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Accounts receivable         4,808,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Inventory         7,555,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Other current assets         520,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Deferred Income taxes         24,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Property, plant, and equipment, net         17,088,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Goodwill         27,216,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Finite-lived intangibles         10,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Short-term and long-term debt         (11,341,000)ravn_Shorttermandlongtermdebt
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Current liabilities         (4,084,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Other liabilities         (5,344,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember
Total purchase price         $ 48,242,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ravn_IntegraPlasticsMember