Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 27, 2018	Oct. 28, 2017	Oct. 27, 2018	Oct. 28, 2017
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 16,946	$ 33,025	$ 2,974	$ 9,231
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	$ 76,643	$ 81,420	$ 24,049	$ 22,843
Effective Income Tax Rate Reconciliation, Percent	22.10%	40.60%	12.40%	40.40%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent			21.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 3,815		$ 20,425
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	5.00%		16.00%