Segment Reporting - Information about Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 26, 2024	Oct. 28, 2023	Oct. 26, 2024	Oct. 28, 2023	Apr. 27, 2024
Segment Reporting Information [Line Items]
Net sales	$ 1,674,375	$ 1,652,772	$ 3,216,117	$ 3,229,517
Operating income (loss)	37,636	56,903	67,005	95,125
Total assets	2,845,602		2,845,602		$ 2,896,732
Consumable
Segment Reporting Information [Line Items]
Net sales	1,347,208	1,319,363	2,625,621	2,635,088
Equipment
Segment Reporting Information [Line Items]
Net sales	215,735	230,293	375,021	394,264
Value-added services and other
Segment Reporting Information [Line Items]
Net sales	111,432	103,116	215,475	200,165
Dental
Segment Reporting Information [Line Items]
Net sales	611,682	626,381	1,162,039	1,193,681
Dental | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	33,660	55,277	60,718	93,947
Total assets	921,931		921,931		913,478
Dental | Consumable
Segment Reporting Information [Line Items]
Net sales	348,908	346,492	693,025	698,539
Dental | Equipment
Segment Reporting Information [Line Items]
Net sales	185,153	200,127	319,011	337,676
Dental | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	77,621	79,762	150,003	157,466
Animal Health
Segment Reporting Information [Line Items]
Net sales	1,054,588	1,024,622	2,037,001	2,035,612
Animal Health | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	29,621	26,346	54,988	56,039
Total assets	1,551,841		1,551,841		1,568,413
Animal Health | Consumable
Segment Reporting Information [Line Items]
Net sales	998,300	972,871	1,932,596	1,936,549
Animal Health | Equipment
Segment Reporting Information [Line Items]
Net sales	30,582	30,166	56,010	56,588
Animal Health | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	25,706	21,585	48,395	42,475
Corporate
Segment Reporting Information [Line Items]
Net sales	8,105	1,769	17,077	224
Corporate | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	(25,645)	(24,720)	(48,701)	(54,861)
Total assets	371,830		371,830		$ 414,841
Corporate | Value-added services and other
Segment Reporting Information [Line Items]
Net sales	8,105	1,769	17,077	224
United States
Segment Reporting Information [Line Items]
Net sales	1,396,411	1,383,152	2,658,277	2,674,523
United States | Dental
Segment Reporting Information [Line Items]
Net sales	561,577	573,794	1,060,534	1,084,044
United States | Animal Health
Segment Reporting Information [Line Items]
Net sales	826,729	807,589	1,580,666	1,590,255
United States | Corporate
Segment Reporting Information [Line Items]
Net sales	8,105	1,769	17,077	224
United Kingdom
Segment Reporting Information [Line Items]
Net sales	195,164	180,460	390,210	372,071
United Kingdom | Animal Health
Segment Reporting Information [Line Items]
Net sales	195,164	180,460	390,210	372,071
Canada
Segment Reporting Information [Line Items]
Net sales	82,800	89,160	167,630	182,923
Canada | Dental
Segment Reporting Information [Line Items]
Net sales	50,105	52,587	101,505	109,637
Canada | Animal Health
Segment Reporting Information [Line Items]
Net sales	$ 32,695	$ 36,573	$ 66,125	$ 73,286