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Shareholders' Equity - Summary of Restricted Stock Awards and Restricted Stock Units Activity (Details) - shares
 12 Months Ended
May. 02, 2015
May. 03, 2014
Apr. 27, 2013
Apr. 28, 2012
Apr. 30, 2011
2010 Stock Plan | RSAs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested and unissued - beginning balance (in shares) 700,000 700,000 700,000    
Awarded (in shares) 0 0 0 100,000 640,000
Vested (in shares) (633,333) 0 0    
Forfeited and cancelled (in shares) 0 0 0    
Unvested and unissued - ending balance (in shares) 66,667 700,000 700,000 700,000  
2010 Stock Plan | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested and unissued - beginning balance (in shares) 60,000 120,000 180,000    
Awarded (in shares) 0 0 0   320,000
Vested (in shares) (60,000) (60,000) (60,000)    
Forfeited and cancelled (in shares) 0 0 0    
Unvested and unissued - ending balance (in shares) 0 60,000 120,000 180,000  
2007 Stock Plan | RSAs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested and unissued - beginning balance (in shares) 0 0 0    
Awarded (in shares) 13,500 27,000 27,000    
Vested (in shares) (13,500) (27,000) (27,000)    
Forfeited and cancelled (in shares) 0 0 0    
Unvested and unissued - ending balance (in shares) 0 0 0 0