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Retirement and Other Employee Benefits - Narrative (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 30, 2016
Jan. 01, 2016
Dec. 26, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year $ 5.2 $ 4.2  
Expected contributions, 2017 1.0    
Expected contributions, 2018 1.0    
Expected contributions, 2019 1.0    
Expected contributions, 2020 1.0    
Expected contributions, thereafter 1.0    
Defined contribution plan expense 1.1 1.2 $ 1.1
Retirement benefits $ 93.6 86.5  
Financial Institutions      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 22.00%    
Consumer Goods      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 13.00%    
Industrial      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 13.00%    
Healthcare Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 11.00%    
Other Industries      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 17.00%    
Technology      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 13.00%    
Consumer Services      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 11.00%    
Equity Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities (minimum) 50.00%    
Plan assets target allocation percentage, equity securities (maximum) 70.00%    
Plan assets target allocation percentage, equity securities 35.00%    
Other international companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities 14.00%    
Fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities (minimum) 30.00%    
Plan assets target allocation percentage, equity securities (maximum) 50.00%    
Plan assets target allocation percentage, equity securities 41.00%    
Cash      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities 10.00%    
US Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year $ 0.4 0.0  
Expected contributions, 2016 0.6    
Net periodic pension costs 0.0 0.1 0.1
Expected future benefit payments, thereafter 5.6    
Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year 2.2 1.7  
Post-retirement Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Retirement benefits $ 15.5 13.7  
United Kingdom | United Kingdom companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities 10.00%    
United Kingdom | Other international companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities 34.00%    
United Kingdom | Growth securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities 34.00%    
United Kingdom | Liability-driven investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities 13.00%    
United Kingdom | United Kingdom corporate bonds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities 9.00%    
United Kingdom | Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year $ 4.7 0.3  
Expected contributions, 2016 1.7    
Net periodic pension costs (0.7) (0.7) (0.9)
Expected future benefit payments, thereafter 11.9    
Central America      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year 0.8 0.8 0.9
Expected contributions, 2016 3.6    
Accrued benefits 5.4 5.8  
Expected future benefit payments, thereafter 2.4    
Central America | Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net periodic pension costs 0.1 0.1 0.3
Central America | Post-retirement Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year 1.3 (1.6)  
Net periodic pension costs 9.8 10.6 9.7
Expected future benefit payments, thereafter 30.5    
KENYA      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year (1.8) (1.9)  
Expected contributions, 2016 0.9   $ 1.1
Total expected benefit payments from 2016 through 2020 3.8    
Accrued benefits 6.1 5.7  
Expected future benefit payments, thereafter 4.2    
KENYA | Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net periodic pension costs 1.1    
Change in Assumptions for Pension Plans | United States      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Increase (decrease) in benefit obligation (0.3)    
Former Executives      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Retirement benefits $ 2.7 $ 1.7