Selected Quarterly Financial Information (Unaudited) Selected Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 27, 2019	Jan. 26, 2019	Oct. 27, 2018	Jul. 28, 2018	Apr. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Revenue, Net (Deprecated 2018-01-31)	$ 334,385	$ 548,008	$ 814,766	$ 337,484	$ 357,654	$ 603,391	$ 886,861	$ 355,711	$ 2,034,643	$ 2,203,617	$ 1,874,362
Gross Profit	117,403	132,953	210,760	66,610	128,334	146,999	216,700	65,200	527,726	557,233	459,061
Net Income (Loss) Attributable to Parent	$ (46,218)	$ 769	$ 59,697	$ (38,622)	$ 17,057	$ (283,235)	$ 48,395	$ (34,783)	$ (24,374)	$ (252,566)	$ 5,361
Earnings Per Share, Basic	$ (0.97)	$ 0.02	$ 1.26	$ (0.82)	$ 0.36	$ (6.04)	$ 1.04	$ (0.75)	$ (0.52)	$ (5.40)	$ 0.12
Earnings Per Share, Diluted	$ (0.97)	$ 0.02	$ 1.25	$ (0.82)	$ 0.36	$ (6.04)	$ 1.03	$ (0.75)	$ (0.52)	$ (5.40)	$ 0.11