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Segment Disclosure - Net Income by Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 25, 2014	Jan. 31, 2015 segment	Jan. 25, 2014
Segment Reporting Information
Number of business units			5us-gaap_NumberOfReportableSegments
Net sales	$ 118,123us-gaap_SalesRevenueNet	$ 115,369us-gaap_SalesRevenueNet	$ 457,856us-gaap_SalesRevenueNet	$ 415,730us-gaap_SalesRevenueNet
Contribution margin	11,368dakt_ContributionMargin	15,901dakt_ContributionMargin	65,937dakt_ContributionMargin	67,846dakt_ContributionMargin
Depreciation and amortization
Depreciation and amortization	3,724us-gaap_DepreciationDepletionAndAmortization	3,581us-gaap_DepreciationDepletionAndAmortization	11,225us-gaap_DepreciationDepletionAndAmortization	10,952us-gaap_DepreciationDepletionAndAmortization
Non-allocated operating expenses:
General and administrative	7,133us-gaap_GeneralAndAdministrativeExpense	6,685us-gaap_GeneralAndAdministrativeExpense	22,890us-gaap_GeneralAndAdministrativeExpense	20,788us-gaap_GeneralAndAdministrativeExpense
Product design and development	5,820us-gaap_ResearchAndDevelopmentExpense	5,649us-gaap_ResearchAndDevelopmentExpense	18,773us-gaap_ResearchAndDevelopmentExpense	17,330us-gaap_ResearchAndDevelopmentExpense
Operating (loss) income	(1,585)us-gaap_OperatingIncomeLoss	3,567us-gaap_OperatingIncomeLoss	24,274us-gaap_OperatingIncomeLoss	29,728us-gaap_OperatingIncomeLoss
Nonoperating income (expense):
Interest income	250us-gaap_InvestmentIncomeNet	290us-gaap_InvestmentIncomeNet	825us-gaap_InvestmentIncomeNet	945us-gaap_InvestmentIncomeNet
Interest expense	(59)us-gaap_InterestExpense	(62)us-gaap_InterestExpense	(183)us-gaap_InterestExpense	(189)us-gaap_InterestExpense
Other income (expense), net	179us-gaap_OtherNonoperatingIncomeExpense	(237)us-gaap_OtherNonoperatingIncomeExpense	(218)us-gaap_OtherNonoperatingIncomeExpense	(351)us-gaap_OtherNonoperatingIncomeExpense
(Loss) income before income taxes	(1,215)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3,558us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	24,698us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	30,133us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax (benefit) expense	(1,776)us-gaap_IncomeTaxExpenseBenefit	687us-gaap_IncomeTaxExpenseBenefit	7,655us-gaap_IncomeTaxExpenseBenefit	9,753us-gaap_IncomeTaxExpenseBenefit
Net income	561us-gaap_NetIncomeLoss	2,871us-gaap_NetIncomeLoss	17,043us-gaap_NetIncomeLoss	20,380us-gaap_NetIncomeLoss
Commerical
Segment Reporting Information
Net sales	37,762us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember	39,016us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember	121,472us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember	117,690us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember
Contribution margin	5,702dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember	7,903dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember	21,822dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember	24,026dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember
Depreciation and amortization
Depreciation and amortization	1,205us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember	1,064us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember	3,630us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember	3,181us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_CommericalMember
Live Events
Segment Reporting Information
Net sales	33,496us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember	33,428us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember	171,811us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember	146,680us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember
Contribution margin	2,072dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember	4,530dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember	20,629dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember	23,159dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember
Depreciation and amortization
Depreciation and amortization	1,145us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember	1,092us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember	3,460us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember	3,354us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_LiveEventsMember
High School Park and Recreation [Member]
Segment Reporting Information
Net sales	10,771us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember	11,010us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember	55,125us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember	47,750us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember
Contribution margin	27dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember	(217)dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember	9,616dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember	5,286dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember
Depreciation and amortization
Depreciation and amortization	460us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember	513us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember	1,381us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember	1,588us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_HighSchoolParkandRecreationMember
Transportation
Segment Reporting Information
Net sales	9,479us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember	13,531us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember	34,807us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember	41,811us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember
Contribution margin	1,317dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember	2,842dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember	7,027dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember	9,747dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember
Depreciation and amortization
Depreciation and amortization	297us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember	292us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember	840us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember	856us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_TransportationMember
International
Segment Reporting Information
Net sales	26,615us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember	18,384us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember	74,641us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember	61,799us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember
Contribution margin	2,250dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember	843dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember	6,843dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember	5,628dakt_ContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember
Depreciation and amortization
Depreciation and amortization	254us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember	210us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember	809us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember	629us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = dakt_InternationalMember
Unallocated
Depreciation and amortization
Depreciation and amortization	$ 363us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember	$ 410us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember	$ 1,105us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember	$ 1,344us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember

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