Credit Facility (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Line of Credit Facility [Line Items]
Long-term Line of Credit, Noncurrent	$ 33,500	$ 96,400
Short-term Debt	100,000	100,000
Proceeds from borrowings on Credit Facility	521,200	674,500	$ 312,700
Repayments of borrowings on Credit Facility	584,100	637,700	153,100
Line of Credit Facility, Fair Value of Amount Outstanding	133,500
Letters of Credit Outstanding, Amount		4,759
Debt Issuance Costs, Gross	3,395		$ 2,912
Write off of Deferred Debt Issuance Cost	$ 118
New Credit Facility
Line of Credit Facility [Line Items]
Credit facility maturity term, in years	5 years
Credit facility, borrowing capacity	$ 400,000
Line Of Credit Potential Increase Amount	100,000
Long-term Line of Credit, Noncurrent	$ 33,500	96,400
Line of Credit Facility, Interest Rate Description	Interest under the Credit Facility accrues, at our election, at a LIBOR or alternate base rate, plus, in each case, an applicable interest rate margin, which is determined by reference to the level of excess availability under the Credit Facility. Loans will initially bear interest at LIBOR plus 1.750% per annum, in the case of LIBOR borrowings, or at the alternate base rate plus 0.750% per annum, in the alternative, and thereafter the interest rate will fluctuate between LIBOR plus 1.750% per annum and LIBOR plus 1.250% per annum (or between the alternate base rate plus 0.750% per annum and the alternate base rate plus 0.250% per annum), based upon the excess availability under the Credit Facility at such time.
New Credit Facility [Member] [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	$ 100,000
Short-term Debt	$ 100,000	$ 100,000
Line of Credit Facility, Interest Rate Description	Loans under the FILO Facility will bear interest at a rate equal to the LIBOR rate, plus 2.750%. The FILO Facility will be available solely during the draw period each year, from April 1 through July 31. We are required to borrow 100% of the aggregate commitments under the FILO Facility on April 1 of each year, and the loans must be repaid in full (including interest and fees) on July 31 of each year. The commitments under the FILO Facility were amended as part of the March 1, 2019 amendment to the Credit Facility and will decrease from $100,000 to $75,000 on August 1, 2019, from $75,000 to $50,000 on August 1, 2020 and from $50,000 to $25,000 on August 1, 2021. We will pay a commitment fee of 0.375% on the daily unused portion of the FILO Facility.
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	$ 500,000