Derivative Financial Instruments (Narrative) (Details) (USD $) In Thousands	Jul. 29, 2011	Apr. 29, 2011	Jul. 30, 2010
Notional amount of interest rate derivatives related to outstanding debt		$ 50,000	$ 50,000
Notional amount of interest rate derivatives related to forecasted debt issuances	200,000
Foreign Currency Contracts 2010 [Member]
Notional amount of foreign currency contracts			2,845
Foreign Currency Contracts 2011 [Member]
Notional amount of foreign currency contracts	3,249		5,425
Foreign Currency Contracts 2012 [Member]
Notional amount of foreign currency contracts	$ 6,432