Note 6 - Derivative Financial Instruments (Detail) - Derivatives Instruments Statements of Financial Performance and Financial Position (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Recognized in AOCI:
Gain (loss) before income taxes	$ 175	$ (3,348)	$ (2,143)	$ (3,936)
Less income tax provision (benefit)	86	(1,215)	(795)	(1,434)
Net	89	(2,133)	(1,348)	(2,502)
Reclassified from AOCI to cost of sales:
Gain (loss) before income taxes	(644)	576	(1,546)	1,719
Less income tax provision (benefit)	(235)	205	(578)	612
Net	(409)	371	(968)	1,107
Net change to AOCI	$ 498	$ (2,504)	$ (380)	$ (3,609)