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Commitments and Contingencies - Purchase Commitments (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Conditional purchase commitment $ 750dakt_ConditionalPurchaseCommitmentAmount
Purchase Obligation, Fiscal Year Maturity  
2015 395us-gaap_PurchaseObligationDueInNextTwelveMonths
2016 1,916us-gaap_PurchaseObligationDueInSecondYear
2017 1,000us-gaap_PurchaseObligationDueInThirdYear
2018 250us-gaap_PurchaseObligationDueInFourthYear
2019 100us-gaap_PurchaseObligationDueInFifthYear
Total $ 3,661us-gaap_PurchaseObligation