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Consolidated Statements of Shareholders' Equity - USD ($)
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income
Treasury Stock
Retained Earnings
Non-Controlling Interest
Beginning Balance (in shares) at May. 02, 2015   39,702,036          
Ending Balance at Apr. 30, 2016 $ 470,100,000 $ 19,100,000 $ 112,300,000 $ (8,400,000) $ (11,500,000) $ 358,600,000 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Earned portion of restricted stock awards (in shares)   430,245          
Earned Portion of Restricted Stock Awards 100,000 $ 100,000          
Stock Award and Stock Option Amortization Expense 7,400,000   7,400,000   0    
Exercise of options (in shares)   47,002          
Exercise of Options $ (7,100,000) $ (100,000) (500,000)     (7,700,000)  
Purchase of common stock (in shares) (1,997,298) (1,997,298)          
Purchase of Common Stock $ (62,300,000) $ (1,000,000)       (61,300,000)  
Tax Benefit from Stock Option Exercises 2,200,000   2,200,000        
Foreign Currency Translation Adjustments (300,000)     (100,000)     (200,000)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest           0  
Net Income 84,600,000         84,600,000  
Cash Dividends on Common Stock (13,500,000)         (13,500,000)  
Ending Balance (in shares) at Apr. 30, 2016   38,181,985          
Beginning Balance at May. 02, 2015 459,000,000 $ 19,900,000 102,200,000 (8,300,000) (11,500,000) 356,500,000 200,000
Ending Balance at Apr. 29, 2017 541,100,000 $ 19,100,000 132,200,000 (25,700,000) (11,500,000) 427,000,000 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Earned portion of restricted stock awards (in shares)   146,192          
Earned Portion of Restricted Stock Awards (1,100,000) $ 100,000       (1,200,000)  
Stock Award and Stock Option Amortization Expense 12,400,000   12,400,000        
Exercise of options (in shares)   147,829          
Exercise of Options $ (2,700,000) $ (100,000) (2,600,000)     0  
Purchase of common stock (in shares) (280,168) (342,081)          
Purchase of Common Stock $ (9,800,000) $ (200,000)       (9,600,000)  
Tax Benefit from Stock Option Exercises 4,900,000   4,900,000        
Foreign Currency Translation Adjustments (17,300,000)     (17,300,000)     0
Net Income 92,900,000         92,900,000  
Cash Dividends on Common Stock (13,700,000)         (13,700,000)  
Ending Balance (in shares) at Apr. 29, 2017   38,133,925          
Ending Balance at Apr. 28, 2018 630,000,000 $ 19,100,000 136,500,000 13,900,000 $ (11,500,000) 472,000,000 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Earned portion of restricted stock awards (in shares)   51,095          
Earned Portion of Restricted Stock Awards (200,000) $ 0       (200,000)  
Stock Award and Stock Option Amortization Expense 4,000,000   4,000,000        
Exercise of options (in shares)   13,333          
Exercise of Options $ (300,000) $ 0 $ (300,000)     0  
Purchase of common stock (in shares) 0            
Foreign Currency Translation Adjustments $ 39,600,000     $ 39,600,000     $ 0
Net Income 57,200,000         57,200,000  
Cash Dividends on Common Stock $ (14,700,000)         $ (14,700,000)  
Ending Balance (in shares) at Apr. 28, 2018   38,198,353