Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 27, 2018	Jan. 28, 2017	Jan. 27, 2018	Jan. 28, 2017
Sales:
Product sales and other	$ 540,903	$ 457,147	$ 1,693,230	$ 1,372,810
Rental income	62,488	64,477	152,733	158,722
Total sales	603,391	521,624	1,845,963	1,531,532
Product and other cost of sales	419,641	366,190	1,326,221	1,098,682
Rental cost of sales	37,215	39,509	91,936	97,998
Total cost of sales	456,856	405,699	1,418,157	1,196,680
Gross profit	146,535	115,925	427,806	334,852
Selling and administrative expenses	111,974	97,111	326,532	282,171
Depreciation and amortization expense	17,007	13,149	48,728	39,057
Other Nonrecurring Expense	313,130	0	313,130	0
Restructuring and other charges	0	0	5,429	1,790
Transaction costs	49	467	1,895	2,638
Operating (loss) income	(295,625)	5,198	(267,908)	9,196
Interest expense, net	2,954	679	7,828	1,975
Income (loss) before taxes	(298,579)	4,519	(275,736)	7,221
Income tax expense (benefit)	(15,344)	758	(6,113)	2,087
Net (loss) income	$ (283,235)	$ 3,761	$ (269,623)	$ 5,134
(Loss) Earnings per share of common stock
Basic	$ (6.04)	$ 0.08	$ (5.77)	$ 0.11
Diluted	$ (6.04)	$ 0.08	$ (5.77)	$ 0.11
Weighted average common shares outstanding
Basic	46,914	46,276	46,712	46,265
Diluted	46,914	46,844	46,712	46,716