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Note 14 - Fair Value Measurement - Fair Value Hierarchy (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	May 01, 2021	May 02, 2020
Cash and cash equivalents	$ 77,590	$ 40,398
Restricted cash	2,812	14
Derivatives - asset position	4	261
Derivatives - liability position	(261)	(17)
Acquisition-related contingent consideration	(363)	(761)
Fair Value, Net Asset (Liability), Total	79,782	41,125
Certificates of Deposit [Member]
Available-for-sale securities:		1,230
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	77,590	40,398
Restricted cash	2,812	14
Derivatives - asset position	0	0
Derivatives - liability position	0	0
Acquisition-related contingent consideration	0	0
Fair Value, Net Asset (Liability), Total	80,402	40,412
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Available-for-sale securities:		0
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Derivatives - asset position	4	261
Derivatives - liability position	(261)	(17)
Acquisition-related contingent consideration	0	0
Fair Value, Net Asset (Liability), Total	(257)	1,474
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Available-for-sale securities:		1,230
Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Derivatives - asset position	0	0
Derivatives - liability position	0	0
Acquisition-related contingent consideration	(363)	(761)
Fair Value, Net Asset (Liability), Total	$ (363)	(761)
Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member]
Available-for-sale securities:		$ 0

X

- Definition

The fair value portion of restricted cash and cash equivalents.

+ References

No definition available.

+ Details

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Namespace Prefix:	dakt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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Period Type:	instant

X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of asset after deduction of liability.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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