Retirement and Other Employee Benefits (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in amount recognized in accumulated other comprehensive income due to change in the method of calculating the discount rate and rate of increase in compensation levels	$ (5.1)	$ (3.3)
Expected contributions, 2013	0.8
Expected contributions, 2014	0.8
Expected contributions, 2015	0.8
Expected contributions, 2016	0.8
Expected contributions, 2017 and thereafter	0.8
Defined contribution plan expense	1.1	1.1	1.1
Financial Institutions [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration	23.00%
Oil and Gas Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration	16.00%
Basic Materials [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration	13.00%
Consumer Goods [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration	12.00%
Industrial [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration	11.00%
Other Industries [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration	25.00%
Equity Securities [Member]
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 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets target allocation percentage, equity securities	42.00%
Other International Companies [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets target allocation percentage, equity securities	37.00%
Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets target allocation percentage, equity securities	12.00%
Fixed Income Securities [Member]
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
UNITED STATES Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in amount recognized in accumulated other comprehensive income due to change in the method of calculating the discount rate and rate of increase in compensation levels	2.8	(2.1)
2012 Amortization of net losses (gains)	(0.4)
Net periodic pension costs	0.1	0.1	0.1
Expected contributions, 2012	0.8
Expected future benefit payments, thereafter	6.1
Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in amount recognized in accumulated other comprehensive income due to change in the method of calculating the discount rate and rate of increase in compensation levels	1.6	1.2
Expected contributions, 2012	2.2
UNITED KINGDOM [Member] | Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in amount recognized in accumulated other comprehensive income due to change in the method of calculating the discount rate and rate of increase in compensation levels	4.5	(4.4)
Net periodic pension costs	(0.9)	(0.1)	(0.1)
Impact in benefit obligation	6.3
Expected future benefit payments, thereafter	13.4
CENTRAL AMERICA [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in amount recognized in accumulated other comprehensive income due to change in the method of calculating the discount rate and rate of increase in compensation levels	(0.8)	(0.9)	(0.9)
Accrued benefits	6.1	6.7
Expected contributions, 2012	0.8
Expected future benefit payments, thereafter	2.9
CENTRAL AMERICA [Member] | Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic pension costs	0.3	0.3	0.3
KENYA
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in amount recognized in accumulated other comprehensive income due to change in the method of calculating the discount rate and rate of increase in compensation levels	1.8	2.1
Accrued benefits	5.7	6.0
Expected contributions, 2012	1.0	1.3	0.7
Expected future benefit payments, thereafter	5.0
KENYA | Pension Plans [Member]
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 [Member] | UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Impact in benefit obligation	$ 0.9