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Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Recent Accounting Pronouncements |  |  |
Cash flows from operating activities | $ 115,750 | $ 147,990 | $ 114,509
Cash flows from financing activities | (76,255) | (53,414) | (63,195)
Cash, cash equivalents and restricted cash at beginning of period | 150,859 | 121,335 | 107,938
Cash, cash equivalents and restricted cash at end of period | 136,871 | 150,859 | 121,335
Net cash provided by (used for) investing activities | (55,224) | (65,230) | (37,229)
Operating income | 129,369 | 133,342 | 125,331
Other income (expense), net | (1,650) | (2,510) | (629)
Early Adoption, Effect | Accounting Standards Update 2016-18 - Restricted Cash |  |  |
Recent Accounting Pronouncements |  |  |
Cash, cash equivalents and restricted cash at beginning of period | $ 9,000 | 9,000 | 9,600
Cash, cash equivalents and restricted cash at end of period |  | 9,000 | 9,000
Net cash provided by (used for) investing activities |  |  | (700)
Early Adoption, Effect | Accounting Standards Update 2017-07 - Pension Costs |  |  |
Recent Accounting Pronouncements |  |  |
Operating income |  | 2,800 | 2,900
Other income (expense), net |  | (2,800) | (2,900)
Early Adoption, Effect | Maximum | Accounting Standards Update 2016-18 - Restricted Cash |  |  |
Recent Accounting Pronouncements |  |  |
Net cash provided by (used for) investing activities |  | 100 |
Adjustment | Accounting Standards Update 2016-09 - Stock Compensation |  |  |
Recent Accounting Pronouncements |  |  |
Cash flows from operating activities |  | 1,800 | 2,100
Cash flows from financing activities |  | $ (1,800) | $ (2,100)

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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