Income from Continued Dumping and Subsidy Offset Act (Details) (USD $)	3 Months Ended	12 Months Ended
	Apr. 28, 2012	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011
Income from Continued Dumping and Subsidy Offset Act [Abstract]
Income from Continued Dumping and Subsidy Offset Act, net		$ 0	$ 18,037,000	$ 1,054,000
Previously withheld distributions received	$ 16,300,000		$ 18,000,000