Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 27, 2018	Oct. 28, 2017	Oct. 27, 2018	Oct. 28, 2017
Sales:
Product sales and other	$ 756,173	$ 820,071	$ 1,074,018	$ 1,155,040
Rental income	58,593	66,790	78,232	87,532
Total sales	814,766	886,861	1,152,250	1,242,572
Product and other cost of sales	568,971	630,176	827,723	907,854
Rental cost of sales	35,035	39,985	47,157	52,818
Total cost of sales	604,006	670,161	874,880	960,672
Gross profit	210,760	216,700	277,370	281,900
Selling and administrative expenses	115,323	115,290	214,467	215,187
Depreciation and amortization expense	16,421	16,704	32,959	31,721
Restructuring and other charges	0	193	0	5,429
Transaction costs	537	1,257	537	1,846
Operating (loss) income	78,479	83,256	29,407	27,717
Interest expense, net	1,836	1,836	5,358	4,874
Income (loss) before taxes	76,643	81,420	24,049	22,843
Income tax expense (benefit)	16,946	33,025	2,974	9,231
Net (loss) income	$ 59,697	$ 48,395	$ 21,075	$ 13,612
(Loss) Earnings per share of common stock
Basic	$ 1.26	$ 1.04	$ 0.45	$ 0.29
Diluted	$ 1.25	$ 1.03	$ 0.44	$ 0.29
Weighted average common shares outstanding
Basic	47,184	46,705	47,050	46,611
Diluted	47,824	47,006	47,689	47,144