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Segment Disclosure - Net Sales and Long-lived Assets by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2015 | Jan. 25, 2014 | Jan. 31, 2015 | Jan. 25, 2014 | Apr. 26, 2014
Net sales: |  |  |  |  |
Net sales | $ 118,123 us-gaap_SalesRevenueNet | $ 115,369 us-gaap_SalesRevenueNet | $ 457,856 us-gaap_SalesRevenueNet | $ 415,730 us-gaap_SalesRevenueNet |
Long-lived assets: |  |  |  |  |
Long-lived assets | 69,963 us-gaap_NoncurrentAssets |  | 69,963 us-gaap_NoncurrentAssets |  | 65,270 us-gaap_NoncurrentAssets
United States |  |  |  |  |
Net sales: |  |  |  |  |
Sales | 90,127 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 94,454 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 370,168 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 343,536 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US |
Long-lived assets: |  |  |  |  |
Long-lived assets | 65,215 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |  | 65,215 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |  | 60,846 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
Outside U.S. |  |  |  |  |
Net sales: |  |  |  |  |
Sales | 27,996 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = dakt_OutsideUnitedStatesMember | 20,915 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = dakt_OutsideUnitedStatesMember | 87,688 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = dakt_OutsideUnitedStatesMember | 72,194 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = dakt_OutsideUnitedStatesMember |
Long-lived assets: |  |  |  |  |
Long-lived assets | $ 4,748 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = dakt_OutsideUnitedStatesMember |  | $ 4,748 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = dakt_OutsideUnitedStatesMember |  | $ 4,424 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = dakt_OutsideUnitedStatesMember

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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