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Derivative Financial Instruments (Details) In Thousands, unless otherwise specified	Jan. 31, 2015 Recurring Basis Level 2 USD ($)	Apr. 26, 2014 Recurring Basis Level 2 USD ($)	Jan. 31, 2015 U.S. Dollars/Australian Dollars USD ($)	Jan. 31, 2015 U.S. Dollars/Australian Dollars AUD	Apr. 26, 2014 U.S. Dollars/Australian Dollars USD ($)	Apr. 26, 2014 U.S. Dollars/Australian Dollars AUD	Jan. 31, 2015 USD to JPY [Member] USD ($)	Jan. 31, 2015 USD to JPY [Member] PLN	Apr. 26, 2014 USD to JPY [Member] USD ($)	Apr. 26, 2014 USD to JPY [Member] PLN	Jan. 31, 2015 U.S. Dollars/Canadian Dollars USD ($)	Jan. 31, 2015 U.S. Dollars/Canadian Dollars CAD	Apr. 26, 2014 U.S. Dollars/Canadian Dollars USD ($)	Apr. 26, 2014 U.S. Dollars/Canadian Dollars CAD	Jan. 31, 2015 U.S. Dollars/British Pounds USD ($)	Jan. 31, 2015 U.S. Dollars/British Pounds GBP (£)	Apr. 26, 2014 U.S. Dollars/British Pounds USD ($)	Apr. 26, 2014 U.S. Dollars/British Pounds GBP (£)	Jan. 31, 2015 USD to SGD USD ($)	Jan. 31, 2015 USD to SGD SGD	Apr. 26, 2014 USD to SGD USD ($)	Apr. 26, 2014 USD to SGD SGD	Jan. 31, 2015 USD to NZD USD ($)	Jan. 31, 2015 USD to NZD BRL	Apr. 26, 2014 USD to NZD USD ($)	Apr. 26, 2014 USD to NZD BRL	Jan. 31, 2015 U.S. Dollars/Euros USD ($)	Jan. 31, 2015 U.S. Dollars/Euros EUR (€)	Apr. 26, 2014 U.S. Dollars/Euros USD ($)	Apr. 26, 2014 U.S. Dollars/Euros EUR (€)
Derivative
Derivatives-currency forward contract, asset	$ 643us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Foreign Currency Exchange Forward Contracts:			1,805invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToAudMember	2,241invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToAudMember	455invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToAudMember	512invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToAudMember	773invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_USDtoJPYMember	91,281invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_USDtoJPYMember	0invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_USDtoJPYMember	0invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_USDtoJPYMember	3,888invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToCadMember	4,399invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToCadMember	0invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToCadMember	0invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToCadMember	809invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToGbpMemberMember	507invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToGbpMemberMember	2,484invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToGbpMemberMember	1,500invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToGbpMemberMember	1,193invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToSgdMember	1,601invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToSgdMember	1,035invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToSgdMember	1,300invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToSgdMember	597invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_USDtoNZDMember	804invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_USDtoNZDMember	0invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_USDtoNZDMember	0invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_USDtoNZDMember	2,219invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToEurMember	1,904invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToEurMember	1,314invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToEurMember	973invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = dakt_UsdToEurMember
Derivatives - currency forward contracts, liability		$ 85us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

+ Details

Name:	us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

+ Details

Name:	us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant