Segment and Geographic Data - Information by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 24, 2021	Jan. 23, 2021	Oct. 24, 2020	Jul. 25, 2020	Apr. 25, 2020	Jan. 25, 2020	Oct. 26, 2019	Jul. 27, 2019	Apr. 24, 2021	Apr. 25, 2020	Apr. 27, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 1,561,793	$ 1,551,268	$ 1,553,168	$ 1,245,837	$ 1,286,461	$ 1,456,155	$ 1,418,744	$ 1,328,651	$ 5,912,066	$ 5,490,011	$ 5,574,523
Property and equipment, net	219,438				303,725				219,438	303,725
Assets	2,751,511				2,715,350				2,751,511	2,715,350
Dental net sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									2,327,021	2,101,922	2,191,790
Assets	863,718				704,216				863,718	704,216
Animal Health net sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									3,559,994	3,336,253	3,354,528
Assets	1,391,892				1,485,284				1,391,892	1,485,284
Corporate net sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									25,051	51,836	28,205
Assets	495,901				525,850				495,901	525,850
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									4,877,070	4,554,345	4,638,184
Property and equipment, net	209,361				294,169				209,361	294,169
United States | Dental net sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									2,107,521	1,900,539	1,989,875
United States | Animal Health net sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									2,744,498	2,601,970	2,620,104
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									677,910	608,320	597,953
Property and equipment, net	2,471				2,030				2,471	2,030
United Kingdom | Animal Health net sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									677,910	608,320	597,953
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									357,086	327,346	338,386
Property and equipment, net	$ 7,606				$ 7,526				7,606	7,526
Canada | Dental net sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									219,500	201,383	201,915
Canada | Animal Health net sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 137,586	$ 125,963	$ 136,471