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Shareholders' Equity - Stock Options Outstanding and Exercisable (Details) (Stock Options, USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Apr. 27, 2013
2010 Stock Plan
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 360,000
Options outstanding - exercise price (in dollars per share) $ 9.53
Options exercisable (in shares) 120,000
Options exercisable - exercise price (in dollars per share) $ 9.73
Intrinsic value of outstanding options $ 1,628
2010 Stock Plan | Exercise Price 1
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 120,000
Options outstanding - exercise price (in dollars per share) $ 9.24
Options outstanding - avg remaining life 7 years 6 months 27 days
Options exercisable (in shares) 80,000
Options exercisable - exercise price (in dollars per share) $ 9.24
Options exercisable - avg. remaining life 7 years 6 months 27 days
2010 Stock Plan | Exercise Price 2
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 120,000
Options outstanding - exercise price (in dollars per share) $ 10.70
Options outstanding - avg remaining life 8 years 3 months 28 days
Options exercisable (in shares) 40,000
Options exercisable - exercise price (in dollars per share) $ 10.70
Options exercisable - avg. remaining life 8 years 3 months 28 days
2010 Stock Plan | Exercise Price 3
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 120,000
Options outstanding - exercise price (in dollars per share) $ 8.64
Options outstanding - avg remaining life 9 years 3 months 23 days
2007 Stock Plan
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 778,000
Options outstanding - exercise price (in dollars per share) $ 5.94
Options exercisable (in shares) 700,500
Options exercisable - exercise price (in dollars per share) $ 5.67
Intrinsic value of outstanding options $ 6,308
2007 Stock Plan | Exercise Price 3
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 42,500
Options outstanding - exercise price (in dollars per share) $ 8.64
Options outstanding - avg remaining life 9 years 3 months 18 days
2007 Stock Plan | Exercise Price 4
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 285,000
Options outstanding - exercise price (in dollars per share) $ 2.72
Options outstanding - avg remaining life 6 years
Options exercisable (in shares) 285,000
Options exercisable - exercise price (in dollars per share) $ 2.72
Options exercisable - avg. remaining life 6 years
2007 Stock Plan | Exercise Price 5
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 260,000
Options outstanding - exercise price (in dollars per share) $ 6.46
Options outstanding - avg remaining life 6 years 3 months 18 days
Options exercisable (in shares) 260,000
Options exercisable - exercise price (in dollars per share) $ 6.46
Options exercisable - avg. remaining life 6 years 3 months 18 days
2007 Stock Plan | Exercise Price 6
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 35,500
Options outstanding - exercise price (in dollars per share) $ 8.13
Options outstanding - avg remaining life 6 years 8 months 12 days
Options exercisable (in shares) 35,500
Options exercisable - exercise price (in dollars per share) $ 8.13
Options exercisable - avg. remaining life 6 years 8 months 12 days
2007 Stock Plan | Exercise Price 7
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 105,000
Options outstanding - exercise price (in dollars per share) $ 10.55
Options outstanding - avg remaining life 7 years 3 months 18 days
Options exercisable (in shares) 105,000
Options exercisable - exercise price (in dollars per share) $ 10.55
Options exercisable - avg. remaining life 7 years 3 months 18 days
2007 Stock Plan | Exercise Price 8
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 50,000
Options outstanding - exercise price (in dollars per share) $ 8.10
Options outstanding - avg remaining life 8 years 6 months
Options exercisable (in shares) 15,000
Options exercisable - exercise price (in dollars per share) $ 8.10
Options exercisable - avg. remaining life 8 years 6 months
2000 and 2004 Stock Plans | Exercise Price 9
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options exercisable (in shares) 72,585
Options exercisable - exercise price (in dollars per share) $ 11.44
Options exercisable - avg. remaining life 1 month 6 days