Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
Sales:
Product sales and other	$ 817,825	$ 697,927	$ 1,152,327	$ 915,663
Rental income	69,036	72,744	90,245	94,245
Total sales	886,861	770,671	1,242,572	1,009,908
Sales Revenue, Goods, Gross		770,671		1,009,908
Product and other cost of sales	628,839	554,498	906,580	732,492
Rental cost of sales	41,464	44,659	54,721	58,489
Total cost of sales	670,303	599,157	961,301	790,981
Gross profit	216,558	171,514	281,271	218,927
Selling and administrative expenses	115,148	101,123	214,558	185,060
Depreciation and amortization expense	16,704	12,987	31,721	25,908
Restructuring and other charges	193	0	5,429	1,790
Transaction costs	1,257	644	1,846	2,171
Operating (loss) income	83,256	56,760	27,717	3,998
Interest expense, net	1,836	630	4,874	1,296
Income (loss) before taxes	81,420	56,130	22,843	2,702
Income tax expense (benefit)	33,025	26,841	9,231	1,329
Net (loss) income	$ 48,395	$ 29,289	$ 13,612	$ 1,373
(Loss) Earnings per share of common stock
Basic	$ 1.04	$ 0.63	$ 0.29	$ 0.03
Diluted	$ 1.03	$ 0.63	$ 0.29	$ 0.03
Weighted average common shares outstanding
Basic	46,705	46,170	46,611	46,259
Diluted	47,006	46,593	47,144	46,652