Retirement and Other Employee Benefits (Assumptions Used in the Calculation of Benefit Obligations and Net Periodic Pension Costs of U.S. and U.K. Defined Benefit Pension Plans and Central American Plans) (Detail)	12 Months Ended
	Dec. 26, 2014		Dec. 27, 2013		Dec. 28, 2012
UNITED STATES Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rate	3.70%		4.45%		3.85%
Rate of increase in compensation levels	0.00%		0.00%		0.00%
Weighted average discount rate	4.45%		3.85%		4.50%
Rate of increase in compensation levels	0.00%		0.00%		0.00%
Expected long-term rate of return on assets	7.50%		7.50%		7.50%
Pension Plans [Member] | UNITED KINGDOM [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rate	3.60%		4.50%		4.10%
Rate of increase in compensation levels	2.20%		2.50%		2.70%
Weighted average discount rate	4.50%		4.10%		4.70%
Rate of increase in compensation levels	2.50%		2.70%		2.90%
Expected long-term rate of return on assets	6.41%		6.41%		5.91%
Post-retirement Plans [Member] | CENTRAL AMERICA [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rate	6.85%	[1]	7.56%	[1]	6.65%
Rate of increase in compensation levels	5.20%		5.39%		5.37%
Weighted average discount rate	7.56%	[1]	6.65%	[1]	7.73%
Rate of increase in compensation levels	5.39%		5.37%		5.04%
Expected long-term rate of return on assets	0.00%		0.00%		0.00%

[1] The increase or decrease in the weighted average discount rate assumption for the benefit obligation and net periodic pension costs increased due to an increase or decrease in inflation assumptions and country-specific investments.