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

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