Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill (Details) $ in Thousands	12 Months Ended
	Apr. 28, 2018 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 813,547
Activity	2,430
Ending Balance	815,977
Operating Segments | Dental
Goodwill [Roll Forward]
Beginning Balance	138,289
Activity	1,365
Ending Balance	139,654
Operating Segments | Animal Health
Goodwill [Roll Forward]
Beginning Balance	675,258
Activity	1,065
Ending Balance	676,323
Operating Segments | Corporate
Goodwill [Roll Forward]
Beginning Balance	0
Activity	0
Ending Balance	$ 0