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Shareholders' Equity (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Dec. 08, 2017
Sep. 08, 2017
Jun. 02, 2017
Mar. 31, 2017
Sep. 09, 2016
Apr. 01, 2016
Jul. 29, 2015
Dec. 30, 2016
Jun. 30, 2016
Feb. 20, 2018
Dec. 29, 2017
Sep. 29, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 30, 2016
Sep. 30, 2016
Jul. 01, 2016
Apr. 01, 2016
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Subsequent Event [Line Items]                                          
Preferred shares, shares authorized (shares)               50,000,000     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 $ 0.01  
Preferred shares, issued (shares)               0     0       0       0 0  
Preferred shares, outstanding (shares)               0     0       0       0 0  
Ordinary shares, authorized (shares)               200,000,000     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 $ 0.01  
Ordinary shares, issued (shares)               51,256,906     48,759,481       51,256,906       48,759,481 51,256,906  
Ordinary shares, outstanding (shares)               51,256,906     48,759,481       51,256,906       48,759,481 51,256,906  
Ordinary shares issued/ (retired) as a result of:                                          
Stock option exercises (shares)                                     59,000 471,653 1,320,103
Restricted share grants (shares)                                     14,294 22,946  
Exercises of stock options (shares)                                     251,303 544,577  
Stock repurchased during period (shares)                                     (2,822,022) (2,325,235)  
Stock repurchase program, term             3 years                            
Total stock repurchase program, authorized repurchase amount             $ 300.0                            
Stock repurchase program, value of ordinary shares repurchased and retired                     $ 240.4               $ 240.4    
Stock repurchase program, ordinary shares repurchased and retired (shares)                     6,029,213               6,029,213    
Common stock repurchase program, maximum remaining amount                     $ 59.6               $ 59.6    
Stock Repurchase Program:                                          
Stock repurchase program, ordinary shares value                                     $ 142.0 $ 106.6  
Stock repurchase program, average purchase price (usd per share)                                     $ 50.31 $ 45.85  
Dividends:                                          
Dividends declared per ordinary share (usd per share) $ 0.150 $ 0.150 $ 0.15 $ 0.15 $ 0.15 $ 0.125   $ 0.15 $ 0.125   $ 0.150 $ 0.150 $ 0.150 $ 0.150 $ 0.150 $ 0.150 $ 0.125 $ 0.125 $ 0.60 $ 0.55 $ 0.50
Payments of dividends, common stock                                     $ 30.1 $ 28.2 $ 26.2
Subsequent Event                                          
Ordinary shares issued/ (retired) as a result of:                                          
Stock repurchase program, ordinary shares repurchased and retired (shares)                   106,300,000                      
Stock Repurchase Program:                                          
Stock repurchase program, average purchase price (usd per share)                   $ 44.82