Segment Reporting - Information about Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 27, 2024	Jan. 28, 2023	Jan. 27, 2024	Jan. 28, 2023	Apr. 29, 2023
Segment Reporting Information [Line Items]
Net sales	$ 1,616,095	$ 1,600,850	$ 4,845,612	$ 4,750,319
Operating income (loss)	70,012	75,922	165,137	170,861
Total assets	2,939,949		2,939,949		$ 2,879,146
Consumable
Segment Reporting Information [Line Items]
Net sales	1,262,290	1,250,859	3,897,378	3,813,884
Equipment
Segment Reporting Information [Line Items]
Net sales	245,262	252,671	639,526	670,502
Value-added services and other
Segment Reporting Information [Line Items]
Net sales	108,543	97,320	308,708	265,933
Dental
Segment Reporting Information [Line Items]
Net sales	637,137	621,796	1,830,818	1,808,636
Dental | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	53,630	60,302	147,577	158,147
Total assets	930,307		930,307		853,369
Dental | Consumable
Segment Reporting Information [Line Items]
Net sales	350,953	330,199	1,049,492	1,005,528
Dental | Equipment
Segment Reporting Information [Line Items]
Net sales	211,352	216,642	549,028	577,158
Dental | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	74,832	74,955	232,298	225,950
Animal Health
Segment Reporting Information [Line Items]
Net sales	967,277	969,378	3,002,889	2,932,744
Animal Health | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	32,104	30,197	88,143	80,372
Total assets	1,617,283		1,617,283		1,570,760
Animal Health | Consumable
Segment Reporting Information [Line Items]
Net sales	911,337	920,660	2,847,886	2,808,356
Animal Health | Equipment
Segment Reporting Information [Line Items]
Net sales	33,910	36,029	90,498	93,344
Animal Health | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	22,030	12,689	64,505	31,044
Corporate
Segment Reporting Information [Line Items]
Net sales	11,681	9,676	11,905	8,939
Corporate | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	(15,722)	(14,577)	(70,583)	(67,658)
Total assets	392,359		392,359		$ 455,017
Corporate | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	11,681	9,676	11,905	8,939
United States
Segment Reporting Information [Line Items]
Net sales	1,335,821	1,344,048	4,010,344	3,980,068
United States | Dental
Segment Reporting Information [Line Items]
Net sales	577,516	562,740	1,661,560	1,638,095
United States | Animal Health
Segment Reporting Information [Line Items]
Net sales	746,624	771,632	2,336,879	2,333,034
United States | Corporate
Segment Reporting Information [Line Items]
Net sales	11,681	9,676	11,905	8,939
United Kingdom
Segment Reporting Information [Line Items]
Net sales	187,735	161,254	559,806	480,600
United Kingdom | Animal Health
Segment Reporting Information [Line Items]
Net sales	187,735	161,254	559,806	480,600
Canada
Segment Reporting Information [Line Items]
Net sales	92,539	95,548	275,462	289,651
Canada | Dental
Segment Reporting Information [Line Items]
Net sales	59,621	59,056	169,258	170,541
Canada | Animal Health
Segment Reporting Information [Line Items]
Net sales	$ 32,918	$ 36,492	$ 106,204	$ 119,110