Taxes (Details)	3 Months Ended		9 Months Ended
	Jan. 25, 2013	Jan. 27, 2012	Jan. 25, 2013
Effective Income Tax Rate [Line Items]
Effective Income Tax Rate, Continuing Operations	160.80%	28.60%
Anticipated Effective Income Tax Rate			(5.20%)
Effective Income Tax Rate Prior to Significant Items	26.60%		32.00%