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Shareholders' Equity - Stock Options Outstanding and Exercisable (Details) (Stock Options, USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
May 03, 2014
2010 Stock Plan
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 420,001
Options outstanding - exercise price (in dollars per share) $ 11.74
Options exercisable (in shares) 180,001
Options exercisable - exercise price (in dollars per share) $ 9.67
Intrinsic value of outstanding options $ 7.3
2010 Stock Plan | Exercise Price 1
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 80,000
Options outstanding - exercise price (in dollars per share) $ 9.24
Options outstanding - avg remaining life 6 years 6 months 16 days
Options exercisable (in shares) 80,000
Options exercisable - exercise price (in dollars per share) $ 9.24
Options exercisable - avg. remaining life 6 years 6 months 16 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) 106,667
Options outstanding - exercise price (in dollars per share) $ 10.70
Options outstanding - avg remaining life 7 years 3 months 17 days
Options exercisable (in shares) 66,667
Options exercisable - exercise price (in dollars per share) $ 10.70
Options exercisable - avg. remaining life 7 years 3 months 17 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) 113,334
Options outstanding - exercise price (in dollars per share) $ 8.64
Options outstanding - avg remaining life 8 years 3 months 12 days
Options exercisable (in shares) 33,334
Options exercisable - exercise price (in dollars per share) $ 8.64
Options exercisable - avg. remaining life 8 years 3 months 12 days
2010 Stock Plan | Exercise Price 4
  
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) $ 17.27
Options outstanding - avg remaining life 9 years 3 months 16 days
2007 Stock Plan
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 172,359
Options outstanding - exercise price (in dollars per share) $ 10.02
Options exercisable (in shares) 84,026
Options exercisable - exercise price (in dollars per share) $ 7.22
Intrinsic value of outstanding options $ 3.3
2007 Stock Plan | Exercise Price 4
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 60,690
Options outstanding - exercise price (in dollars per share) $ 6.46
Options outstanding - avg remaining life 5 years 3 months 3 days
Options exercisable (in shares) 60,690
Options exercisable - exercise price (in dollars per share) $ 6.46
Options exercisable - avg. remaining life 5 years 3 months 3 days
2007 Stock Plan | Exercise Price 5
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) 10,000
Options outstanding - exercise price (in dollars per share) $ 10.55
Options outstanding - avg remaining life 6 years 3 months 13 days
Options exercisable (in shares) 10,000
Options exercisable - exercise price (in dollars per share) $ 10.55
Options exercisable - avg. remaining life 6 years 3 months 13 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) 29,168
Options outstanding - exercise price (in dollars per share) $ 8.10
Options outstanding - avg remaining life 7 years 5 months 21 days
Options exercisable (in shares) 11,668
Options exercisable - exercise price (in dollars per share) $ 8.10
Options exercisable - avg. remaining life 7 years 5 months 21 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) 30,001
Options outstanding - exercise price (in dollars per share) $ 8.64
Options outstanding - avg remaining life 8 years 3 months 12 days
Options exercisable (in shares) 1,668
Options exercisable - exercise price (in dollars per share) $ 8.64
Options exercisable - avg. remaining life 8 years 3 months 12 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) 42,500
Options outstanding - exercise price (in dollars per share) $ 17.27
Options outstanding - avg remaining life 9 years 3 months 16 days