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Nature of Business and Summary of Significant Accounting Policies Insurance (Details) - USD ($) $ in Thousands | Apr. 29, 2017 | Apr. 30, 2016
--- | --- | ---
Accrued expenses |  |
Self-insurance liability | $ 2,367 | $ 2,314

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- Definition Self Insurance Liability + References No definition available. + Details
Name: | dakt_SelfInsuranceLiability
Namespace Prefix: | dakt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_AccruedLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |