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v3.20.1

Nature of Business and Summary of Significant Accounting Policies Property and Equipment (Details) | 12 Months Ended
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May 02, 2020
Buildings | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 5 years
Buildings | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 40 years
Machinery and equipment | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 5 years
Machinery and equipment | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 7 years
Office furniture and equipment | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 3 years
Office furniture and equipment | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 5 years
Computer software and hardware | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 3 years
Computer software and hardware | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 5 years
Equipment held for rental | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 2 years
Equipment held for rental | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 7 years
Demonstration equipment | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 3 years
Demonstration equipment | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 5 years
Transportation equipment | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 5 years
Transportation equipment | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 7 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=dakt_EquipmentHeldForRentalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=dakt_DemonstrationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_TransportationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |