Income Taxes , Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	21.00%	30.50%	35.00%
Increase (decrease) in tax rate resulting from:
U.S. state taxes, net of federal tax benefit	0.90%	0.80%	1.00%
Research and development credit	(1.20%)	(0.80%)	(0.90%)
Puerto Rico Excise Tax	(1.60%)	(1.10%)	(1.50%)
International	(10.70%)	(18.90%)	(27.90%)
U.S. Tax Reform	0.20%	43.00%	0.00%
Stock based compensation	(1.00%)	(1.00%)	0.00%
Other, net	(0.20%)	3.00%	(1.00%)
Divestiture related	0.00%	(3.80%)	0.00%
Certain tax adjustments	(1.00%)	(8.90%)	4.40%
U.S. tax on foreign earnings	4.10%	2.70%	3.50%
Effective tax rate	10.50%	45.50%	12.60%