Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
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)

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.

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-Name Accounting Standards Codification
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-Section 45
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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.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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