Note 7 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 29, 2017	Apr. 30, 2016	May 02, 2015
Current	$ 54,422	$ 32,806	$ 24,326
Deferred income tax provision (benefit)	1,358	(1,299)	1,076
Total	$ 55,780	$ 31,507	$ 25,402