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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. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Recognized in AOCI-      
Gain (loss) before income taxes $ (6,138) $ 9,498 $ (984)
Less income tax provision (benefit) (1,468) 3,085 (365)
Net (4,670) 6,413 (619)
Reclassified from AOCI to cost of sales-      
Gain (loss) before income taxes 2,100 2,569 (2,749)
Less income tax provision (benefit) 452 1,383 (1,020)
Net 1,648 1,186 (1,729)
Net change to AOCI $ (6,318) $ 5,227 $ 1,110