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Nature of Business and Summary of Significant Accounting Policies Insurance (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Apr. 30, 2016
Accrued expenses
Self-insurance liability	$ 2,367	$ 2,314

X

- Definition

Self Insurance Liability

+ References

No definition available.

+ Details

Name:	dakt_SelfInsuranceLiability
Namespace Prefix:	dakt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_AccruedLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: