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Commitments and Contingencies - Guarantees and Warranties (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2015
Movement in Standard Product Warranty Accrual
Beginning accrued warranty costs	$ 27,250us-gaap_ProductWarrantyAccrual
Warranties issued during the period	8,975us-gaap_ProductWarrantyAccrualWarrantiesIssued
Settlements made during the period	(10,325)us-gaap_ProductWarrantyAccrualPayments
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations	1,729us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease
Ending accrued warranty costs	27,629us-gaap_ProductWarrantyAccrual
Minimum
Warranties:
Standard parts warranty period	1 year
Installation warranty period	1 year
Maximum
Warranties:
Standard parts warranty period	5 years
Installation warranty period	10 years
Repurchase of equipment guarantees
Guarantees:
Guarantees total obligations	1,100us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = dakt_RepurchaseOfLeasedEquipmentGuaranteeMember
Performance guarantees | Letter of credit and bank guarantees agreements
Guarantees:
Performance guarantees outstanding	5,102us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_PerformanceGuaranteeMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialStandbyLetterOfCreditMember
Performance guarantees | Surety bonds
Guarantees:
Performance guarantees outstanding	$ 16,711us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_PerformanceGuaranteeMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_SuretyBondMember

X

- Definition

Product Warranty Accrual, Installation Warranty Coverage Term

+ References

No definition available.

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- Definition

Product Warranty Accrual, Standard Parts Warranty Coverage Term

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

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- Definition

Amount of loss contingency liability.

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-Publisher FASB

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-SubTopic 20

-Section 50

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

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-Publisher FASB

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-SubTopic 210

-Section S99

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Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.

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Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard and extended product warranties (including adjustments for changes in estimates).

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Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

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