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Sale of Theatre Rigging Manufacturing (Details) (Theatre Rigging Manufacturing [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Jan. 31, 2015
Jul. 31, 2014
Theatre Rigging Manufacturing [Member]
   
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Gain from sale of division $ 1.3us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= dakt_TheatreRiggingManufacturingMember
 
Assets sold   2.8us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= dakt_TheatreRiggingManufacturingMember
Accounts payable sold   $ 0.4us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= dakt_TheatreRiggingManufacturingMember