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Note 11 - Retirement Benefits (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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May 01, 2021 | May 02, 2020 | Apr. 27, 2019
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 50.00% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 6.00% |  |
Defined Contribution Plan, Award Requisite Service Period (Month) | 3 months |  |
Defined Contribution Plan, Cost | $ 0 | $ 2,917 | $ 2,754
Defined Contribution Plan, Attained Age (Year) | 21 years |  |

X
- Definition Represents attained age for defined contributing plan. + References No definition available. + Details
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Namespace Prefix: | dakt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents award requisite service period for defined contribution plan. + References No definition available. + Details
Name: | dakt_DefinedContributionPlanAwardRequisiteServicePeriod
Namespace Prefix: | dakt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration