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Note 1 - Nature of Business and Summary of Significant Accounting Policies - Estimated Useful Lives (Details)	12 Months Ended
	May 01, 2021
Building and Building Improvements [Member] | Minimum [Member]
Estimated useful life (Year)	5 years
Building and Building Improvements [Member] | Maximum [Member]
Estimated useful life (Year)	40 years
Machinery and Equipment [Member] | Minimum [Member]
Estimated useful life (Year)	5 years
Machinery and Equipment [Member] | Maximum [Member]
Estimated useful life (Year)	7 years
Office Furniture and Equipment [Member] | Minimum [Member]
Estimated useful life (Year)	3 years
Office Furniture and Equipment [Member] | Maximum [Member]
Estimated useful life (Year)	5 years
Computer Equipment [Member] | Minimum [Member]
Estimated useful life (Year)	3 years
Computer Equipment [Member] | Maximum [Member]
Estimated useful life (Year)	5 years
Equipment Held For Rental [Member] | Minimum [Member]
Estimated useful life (Year)	2 years
Equipment Held For Rental [Member] | Maximum [Member]
Estimated useful life (Year)	7 years
Demonstration Equipment [Member] | Minimum [Member]
Estimated useful life (Year)	3 years
Demonstration Equipment [Member] | Maximum [Member]
Estimated useful life (Year)	5 years
Transportation Equipment [Member] | Minimum [Member]
Estimated useful life (Year)	5 years
Transportation Equipment [Member] | Maximum [Member]
Estimated useful life (Year)	7 years

X

- 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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dakt_OfficeFurnitureAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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