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Retirement and Other Employee Benefits - Narrative (Detail) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2016
Dec. 26, 2014
Dec. 27, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year $ 4.2 $ 5.1  
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 $ 1.2 1.1 $ 1.1
Financial Institutions      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 24.00%    
Oil and Gas Company      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 8.00%    
Materials Businesses      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 4.00%    
Consumer Goods      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 15.00%    
Industrial      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 11.00%    
Healthcare Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 10.00%    
Other Industries      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Portfolio of stocks invested, industry concentration 27.00%    
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%    
United Kingdom companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities 41.00%    
Other international companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities 38.00%    
Fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets target allocation percentage, equity securities 21.00%    
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%    
Investment maturity period 15 years    
US Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year $ 0.0 2.8  
Expected contributions, 2016 0.3    
Net periodic pension costs 0.1 0.1 0.1
Expected future benefit payments, thereafter 5.9    
Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year 1.7 1.6  
Expected contributions, 2016 2.1    
United Kingdom | Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year 0.3 4.5  
Net periodic pension costs (0.7) (0.9) (0.1)
Expected future benefit payments, thereafter 13.5    
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 3.8    
Accrued benefits 5.8 6.1  
Expected future benefit payments, thereafter 2.6    
Central America | Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net periodic pension costs 0.1 0.3 0.3
KENYA      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (losses) gains occurring during the year (1.9) (1.8)  
Expected contributions, 2016 0.5 $ 1.1 $ 1.3
Total expected benefit payments from 2016 through 2020 3.6    
Accrued benefits 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 0.9    
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 $ (0.7)