Segment Reporting - Information about Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 28, 2023	Jan. 29, 2022	Jan. 28, 2023	Jan. 29, 2022	Apr. 30, 2022
Segment Reporting Information [Line Items]
Net sales	$ 1,600,850	$ 1,596,596	$ 4,750,319	$ 4,860,633
Operating income (loss)	75,922	60,833	170,861	84,164
Total assets	2,941,991		2,941,991		$ 2,741,630
Consumable
Segment Reporting Information [Line Items]
Net sales	1,250,859	1,237,127	3,813,884	3,923,613
Equipment and software
Segment Reporting Information [Line Items]
Net sales	252,671	276,446	670,502	683,711
Value-added services and other
Segment Reporting Information [Line Items]
Net sales	97,320	83,023	265,933	253,309
Dental
Segment Reporting Information [Line Items]
Net sales	621,796	650,633	1,808,636	1,879,715
Dental | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	60,302	64,125	158,147	118,609
Total assets	912,422		912,422		851,746
Dental | Consumable
Segment Reporting Information [Line Items]
Net sales	330,199	337,192	1,005,528	1,070,422
Dental | Equipment and software
Segment Reporting Information [Line Items]
Net sales	216,642	241,384	577,158	591,787
Dental | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	74,955	72,057	225,950	217,506
Animal Health
Segment Reporting Information [Line Items]
Net sales	969,378	944,774	2,932,744	2,975,031
Animal Health | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	30,197	23,420	80,372	73,360
Total assets	1,635,193		1,635,193		1,459,450
Animal Health | Consumable
Segment Reporting Information [Line Items]
Net sales	920,660	899,935	2,808,356	2,853,191
Animal Health | Equipment and software
Segment Reporting Information [Line Items]
Net sales	36,029	35,062	93,344	91,924
Animal Health | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	12,689	9,777	31,044	29,916
Corporate
Segment Reporting Information [Line Items]
Net sales	9,676	1,189	8,939	5,887
Corporate | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	(14,577)	(26,712)	(67,658)	(107,805)
Total assets	394,376		394,376		$ 430,434
Corporate | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	9,676	1,189	8,939	5,887
United States
Segment Reporting Information [Line Items]
Net sales	1,344,048	1,329,051	3,980,068	4,006,576
United States | Dental
Segment Reporting Information [Line Items]
Net sales	562,740	591,397	1,638,095	1,694,044
United States | Animal Health
Segment Reporting Information [Line Items]
Net sales	771,632	736,465	2,333,034	2,306,645
United States | Corporate
Segment Reporting Information [Line Items]
Net sales	9,676	1,189	8,939	5,887
United Kingdom
Segment Reporting Information [Line Items]
Net sales	161,254	168,568	480,600	545,321
United Kingdom | Animal Health
Segment Reporting Information [Line Items]
Net sales	161,254	168,568	480,600	545,321
Canada
Segment Reporting Information [Line Items]
Net sales	95,548	98,977	289,651	308,736
Canada | Dental
Segment Reporting Information [Line Items]
Net sales	59,056	59,236	170,541	185,671
Canada | Animal Health
Segment Reporting Information [Line Items]
Net sales	$ 36,492	$ 39,741	$ 119,110	$ 123,065