Income Per Share (Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share) (Details)		12 Months Ended
	Sep. 30, 2005	Apr. 26, 2013 Service-based stock options [Member]		Apr. 27, 2012 Service-based stock options [Member]		Apr. 29, 2011 Service-based stock options [Member]		Apr. 26, 2013 Warrants' liability [Member]		Apr. 27, 2012 Warrants' liability [Member]		Apr. 29, 2011 Warrants' liability [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the computation of earnings per share		30,987	[1]	111,738	[1]	474,887	[1]	0	[1],[2]	3,012,050	[1],[2]	3,012,050	[1],[2]
Class of warrant or right, exercise price of warrants or rights	50.00

[1] Outstanding options to purchase common shares that are excluded from the computation of earnings per share because to include them would have been anti-dilutive.

[2] In conjunction with our Convertible Notes issuance in September 2005, we sold common stock warrants at an exercise price of $50.00 per share. The warrants were anti-dilutive for the fiscal years 2012 and 2011 because the exercise price of the warrants exceeded the average market price of our stock during those fiscal years. The warrants were settled during the quarter ended January 25, 2013.