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Note 6 - Derivative Financial Instruments - Derivatives Instruments, Statements of Financial Performance and Financial Position (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Recognized in AOCI-      
Gain (loss) before income taxes $ 9,498 $ (984) $ (5,743)
Less income tax provision (benefit) 3,085 (365) (2,131)
Net 6,413 (619) (3,612)
Reclassified from AOCI to cost of sales-      
Gain (loss) before income taxes 2,569 (2,749) (6,987)
Less income tax provision (benefit) 1,383 (1,020) (2,592)
Net 1,186 (1,729) (4,395)
Net change to AOCI $ 5,227 $ 1,110 $ 783