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Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 25, 2020	Jul. 27, 2019	Apr. 25, 2020	Apr. 27, 2019	Apr. 28, 2018
Goodwill [Roll Forward]
Beginning Balance		$ 816,226	$ 816,226
Impairment			(675,055)	$ 0	$ 0
Other Activity			(2,447)
Ending Balance	$ 138,724		138,724	816,226
Animal Health net sales
Goodwill [Roll Forward]
Impairment	(269,000)	(406,055)
Operating Segments \| Dental net sales
Goodwill [Roll Forward]
Beginning Balance		139,160	139,160
Other Activity			(436)
Ending Balance	138,724		138,724	139,160
Operating Segments \| Animal Health net sales
Goodwill [Roll Forward]
Beginning Balance		677,066	677,066
Other Activity			(2,011)
Ending Balance	0		0	677,066
Operating Segments \| Corporate net sales
Goodwill [Roll Forward]
Beginning Balance		$ 0	0
Other Activity			0
Ending Balance	$ 0		$ 0	$ 0