Schedule II Valuation and Qualifying Accounts Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense		$ 2,670	$ 3,518	$ 3,459
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction		(2,618)	(3,694)	(3,520)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 2,135	2,083	2,259	2,320
Sales Returns and Allowances [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account	197,799	170,469	155,486
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	(197,746)	(172,057)	(149,426)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 5,282	$ 5,229	$ 6,817	$ 757