Acquisitions and Strategic Agreements Acquisitions and Strategic Agreements (Promoversity Details) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Payments to Acquire Businesses, Net of Cash Acquired	$ 58,259	$ 186,720	$ 17,843
Goodwill, Acquired During Period		48,556
Promoversity [Member]
Payments to Acquire Businesses, Net of Cash Acquired		1,417
Finite-lived Intangible Assets Acquired		$ 741
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		5 years
Goodwill, Acquired During Period		$ 441
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets		221
Business Combination, Contingent Consideration, Liability		$ 500