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Financing Agreements - (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 26, 2014
Line of Credit Facility [Line Items]
Debt instrument, actual, fixed charge coverage ratio	5600.00%
Debt instrument, actual, interest-bearing debt, ratio	6.00%
Line of Credit
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 35.0
Effective interest rate	1.60%
Line of credit facility, unused capacity, commitment fee percentage	0.125%
Debt instrument, restrictive covenants, fixed charge coverage ratio	200.00%
Debt instrument, restrictive covenants, capital expenditure reserve, amount	6
Debt instrument, restrictive covenants, interest-bearing debt, ratio	100.00%
Standby Letters of Credit
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	15.0
Line of Credit Facility, Amount Outstanding	6.7
Foreign Line of Credit
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	40.0
Debt instrument, restrictive covenants, fixed charge coverage ratio	200.00%
Debt instrument, restrictive covenants, capital expenditure reserve, amount	6
Debt instrument, restrictive covenants, interest-bearing debt, ratio	100.00%
Bank Guarantees
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 4.6
LIBOR | Minimum | Line of Credit
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	145.00%
LIBOR | Maximum | Line of Credit
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	195.00%

X

- Definition

Debt Instrument, Actual, Fixed Charge Coverage Ratio

+ References

No definition available.

+ Details

Name:	dakt_DebtInstrumentActualFixedChargeCoverageRatio
Namespace Prefix:	dakt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Debt Instrument, Actual, Interest-Bearing Debt, Ratio

+ References

No definition available.

+ Details

Name:	dakt_DebtInstrumentActualInterestBearingDebtRatio
Namespace Prefix:	dakt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Debt Instrument, Restrictive Covenants, Capital Expenditure Reserve, Amount

+ References

No definition available.

+ Details

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

X

- Definition

Debt Instrument, Restrictive Covenants, Fixed Charge Coverage Ratio

+ References

No definition available.

+ Details

Name:	dakt_DebtInstrumentRestrictiveCovenantsFixedChargeCoverageRatio
Namespace Prefix:	dakt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Debt Instrument, Restrictive Covenants, Interest-Bearing Debt, Ratio

+ References

No definition available.

+ Details

Name:	dakt_DebtInstrumentRestrictiveCovenantsInterestBearingDebtRatio
Namespace Prefix:	dakt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration