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Shareholders' Equity (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 07, 2018
Sep. 07, 2018
Jun. 01, 2018
Mar. 30, 2018
Feb. 21, 2018
Dec. 08, 2017
Sep. 08, 2017
Jun. 02, 2017
Mar. 31, 2017
Dec. 28, 2018
Sep. 28, 2018
Jun. 29, 2018
Mar. 30, 2018
Dec. 29, 2017
Sep. 29, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Feb. 19, 2019
Subsequent Event [Line Items]                                          
Preferred shares, shares authorized (shares)                   50,000,000       50,000,000       50,000,000 50,000,000    
Preferred shares, par value (usd per share)                   $ 0.01       $ 0.01       $ 0.01 $ 0.01    
Preferred shares, issued (shares)                   0       0       0 0    
Preferred shares, outstanding (shares)                   0       0       0 0    
Ordinary shares, authorized (shares)                   200,000,000       200,000,000       200,000,000 200,000,000    
Ordinary shares, par value (usd per share)                   $ 0.01       $ 0.01       $ 0.01 $ 0.01    
Ordinary shares, issued (shares)                   48,442,296       48,759,481       48,442,296 48,759,481    
Ordinary shares, outstanding (shares)                   48,442,296       48,759,481       48,442,296 48,759,481    
Ordinary shares issued/ (retired) as a result of:                                          
Stock option exercises (shares)                                   38,500 59,000    
Restricted share grants (shares)                                   22,991 14,294    
Exercises of stock options (shares)                                   351,856 251,303    
Stock repurchased during period (shares)                                   (730,532) (2,822,022)    
Stock repurchase program, term         3 years                                
Stock Repurchase Program, Authorized Amount         $ 300.0                                
Stock repurchase program, value of ordinary shares repurchased and retired                   $ 29.4               $ 29.4      
Stock repurchase program, ordinary shares repurchased and retired (shares)                   730,532               730,532      
Common stock repurchase program, maximum remaining amount                   $ 280.4               $ 280.4      
Stock Repurchase Program:                                          
Stock repurchase program, ordinary shares value                                   $ 29.4 $ 142.0    
Stock repurchase program, average purchase price (usd per share)                                   $ 40.26 $ 50.31    
Dividends:                                          
Dividends declared per ordinary share (usd per share) $ 0.150 $ 0.150 $ 0.15 $ 0.15   $ 0.150 $ 0.150 $ 0.15 $ 0.15 $ 0.150 $ 0.150 $ 0.150 $ 0.150 $ 0.150 $ 0.150 $ 0.150 $ 0.150 $ 0.60 $ 0.60 $ 0.55  
Payments of dividends, common stock                                   $ 29.0 $ 30.1 $ 28.2  
Subsequent Event                                          
Ordinary shares issued/ (retired) as a result of:                                          
Stock repurchase program, ordinary shares repurchased and retired (shares)                                         0