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Commitments and Contingencies - Other Long-term Obligations (Details) - USD ($) $ in Thousands | Apr. 28, 2018 | Apr. 29, 2017
--- | --- | ---
Other Commitments [Line Items] |  |
Other Commitment | $ 2,408 | $ 3,224
Less: current liability | 1,187 | 1,506
Other long-term obligations | 1,221 | 1,718
Advertising |  |
Other Commitments [Line Items] |  |
Other Commitment | 408 | 580
Deferred purchase price |  |
Other Commitments [Line Items] |  |
Other Commitment | 1,844 | 2,479
Long-term Debt [Member] |  |
Other Commitments [Line Items] |  |
Other Commitment | $ 156 | $ 165

X
- Definition Other Commitments, Excluding Current + References No definition available. + Details
Name: | dakt_OtherCommitmentsExcludingCurrent
Namespace Prefix: | dakt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment maturing in the next fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OtherCommitmentsAxis=dakt_AdvertisingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=dakt_DeferredPurchasePriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=us-gaap_LongTermDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |