Segment Reporting - Information about Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 28, 2023	Oct. 29, 2022	Apr. 29, 2023
Segment Reporting Information [Line Items]
Net sales	$ 1,652,772	$ 1,626,204	$ 3,229,517	$ 3,149,469
Operating income (loss)	56,903	60,095	95,125	94,939
Total assets	2,889,690		2,889,690		$ 2,879,146
Consumable
Segment Reporting Information [Line Items]
Net sales	1,319,363	1,301,256	2,635,088	2,563,025
Equipment
Segment Reporting Information [Line Items]
Net sales	230,293	243,896	394,264	417,831
Value-added services and other
Segment Reporting Information [Line Items]
Net sales	103,116	81,052	200,165	168,613
Dental
Segment Reporting Information [Line Items]
Net sales	626,381	628,923	1,193,681	1,186,840
Dental | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	55,277	60,950	93,947	97,845
Total assets	924,784		924,784		853,369
Dental | Consumable
Segment Reporting Information [Line Items]
Net sales	346,492	337,489	698,539	675,329
Dental | Equipment
Segment Reporting Information [Line Items]
Net sales	200,127	214,006	337,676	360,516
Dental | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	79,762	77,428	157,466	150,995
Animal Health
Segment Reporting Information [Line Items]
Net sales	1,024,622	1,002,996	2,035,612	1,963,366
Animal Health | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	26,346	28,316	56,039	50,175
Total assets	1,578,789		1,578,789		1,570,760
Animal Health | Consumable
Segment Reporting Information [Line Items]
Net sales	972,871	963,767	1,936,549	1,887,696
Animal Health | Equipment
Segment Reporting Information [Line Items]
Net sales	30,166	29,890	56,588	57,315
Animal Health | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	21,585	9,339	42,475	18,355
Corporate
Segment Reporting Information [Line Items]
Net sales	1,769	(5,715)	224	(737)
Corporate | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	(24,720)	(29,171)	(54,861)	(53,081)
Total assets	386,117		386,117		$ 455,017
Corporate | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	1,769	(5,715)	224	(737)
United States
Segment Reporting Information [Line Items]
Net sales	1,383,152	1,375,622	2,674,523	2,636,020
United States | Dental
Segment Reporting Information [Line Items]
Net sales	573,794	575,520	1,084,044	1,075,355
United States | Animal Health
Segment Reporting Information [Line Items]
Net sales	807,589	805,817	1,590,255	1,561,402
United States | Corporate
Segment Reporting Information [Line Items]
Net sales	1,769	(5,715)	224	(737)
United Kingdom
Segment Reporting Information [Line Items]
Net sales	180,460	157,125	372,071	319,346
United Kingdom | Animal Health
Segment Reporting Information [Line Items]
Net sales	180,460	157,125	372,071	319,346
Canada
Segment Reporting Information [Line Items]
Net sales	89,160	93,457	182,923	194,103
Canada | Dental
Segment Reporting Information [Line Items]
Net sales	52,587	53,403	109,637	111,485
Canada | Animal Health
Segment Reporting Information [Line Items]
Net sales	$ 36,573	$ 40,054	$ 73,286	$ 82,618