Derivatives (Details)	1 Months Ended	12 Months Ended
	Sep. 30, 2005 USD ($)	Apr. 26, 2013 USD ($)	Apr. 27, 2012 USD ($)	Apr. 29, 2011 USD ($)	Oct. 26, 2012 USD ($)	Apr. 27, 2012 EUR (€)	Apr. 29, 2011 EUR (€)	Sep. 30, 2005 Convertible Subordinated Debt [Member] USD ($)
Derivatives, Fair Value [Line Items]
Aggregate foreign currency transaction loss		$ 304,000
Transaction Effects Exclusive Of Hedging Results			1,841,000	1,093,000
Foreign currency contracts						31,500,000	24,300,000
Foreign currency contracts, maximum amount outstanding						11,500,000	8,300,000
Senior Notes								125,000,000
Proceeds from Issuance of Warrants	25,200,000
Number of common stock a warrant entitles holders to purchase	3,012,050
Class of warrant or right, exercise price of warrants or rights	50.00
Reclassification from common stock warrants to warrants' liability		3,649,637	0	0
Warrants' liability revalued					2,321,951
Derivative, Gain (Loss) on Derivative, Net		$ 1,325,574	$ 0	$ 0