Note 5 - Derivative Financial Instruments (Details) - Derivatives Instruments Statements of Financial Performance and Financial Position (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 27, 2013	Jul. 28, 2012
Recognized in AOCL:
Loss before income taxes	$ (1,012)	$ (2,318)
Less income tax benefit	(376)	(881)
Net	(636)	(1,437)
Reclassified from AOCL to cost of sales:
Loss before income taxes	(566)	(902)
Less income tax benefit	(210)	(343)
Net	(356)	(559)
Net change to AOCL	$ (280)	$ (878)