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Subsequent Events - (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 16, 2016 | Jun. 03, 2016 | Apr. 30, 2016 | May 02, 2015 | Apr. 26, 2014
Subsequent Event [Line Items] |  |  |  |  |
Cash dividend declared (usd per share) |  |  | $ 0.40 | $ 0.4 | $ 0.39
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Cash dividend declared (usd per share) |  | $ 0.06 |  |  |
Special dividend declared (usd per share) | $ 0.04 |  |  |  |
Stock repurchase program, authorized amount | $ 40,000,000.0 |  |  |  |

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- Definition Common Stock, Special Dividends, Per Share, Declared + References No definition available. + Details
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Namespace Prefix: | dakt_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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