Segment and Geographic Data - Information about Reportable Segments (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
Segment Reporting Information [Line Items]
Operating income (loss)	$ 37,348	$ 61,681	$ 73,706	$ 37,872	$ (614,463)	$ 43,816	$ (18,146)	$ 16,674	$ 210,607	$ (572,119)	$ 137,716
Depreciation and amortization									76,549	82,182	82,773
Total assets	2,751,511				2,715,350				2,751,511	2,715,350
Dental net sales
Segment Reporting Information [Line Items]
Operating income (loss)									201,244	168,304	179,236
Depreciation and amortization									7,774	8,434	8,792
Total assets	863,718				704,216				863,718	704,216
Animal Health net sales
Segment Reporting Information [Line Items]
Operating income (loss)									88,123	(594,743)	81,472
Depreciation and amortization									45,771	49,958	49,362
Total assets	1,391,892				1,485,284				1,391,892	1,485,284
Corporate net sales
Segment Reporting Information [Line Items]
Operating income (loss)									(78,760)	(145,680)	(122,992)
Depreciation and amortization									23,004	23,790	$ 24,619
Total assets	$ 495,901				$ 525,850				$ 495,901	$ 525,850