Retirement and Other Employee Benefits (Reconciliation of Benefit Obligations, Plan Assets and Funded Status for Defined Benefit Pension Plans and Post-Retirement Plans) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 26, 2014		Dec. 27, 2013		Dec. 28, 2012
Change in Plan Assets:
Beginning fair value	$ 14.2
Ending fair value	14.1		14.2
Amounts recognized in Accumulated other comprehensive income (loss):
Net (losses) gains occuring during the year	5.1		3.3
CENTRAL AMERICA [Member]
Amounts recognized in Accumulated other comprehensive income (loss):
Net (losses) gains occuring during the year	0.8		0.9		0.9
UNITED KINGDOM [Member]
Change in Plan Assets:
Ending fair value	55.4		54.9
UNITED STATES Pension Plans [Member]
Change in Benefit Obligation:
Beginning benefit obligation	17.4	[1]	19.1	[1]
Service cost	0	[1]	0	[1]	0
Interest cost	0.7	[1]	0.7	[1]	0.8
Actuarial loss (gain)	2.6	[1]	(0.9)	[1]
Benefits paid	(1.4)	[1]	(1.5)	[1]
Exchange rate changes	0	[1],[2]	0	[1],[2]
Ending benefit obligation	19.3	[1]	17.4	[1]	19.1	[1]
Change in Plan Assets:
Beginning fair value	14.2	[1]	13.5	[1]
Actual return on plan assets	0.8	[1]	2.0	[1]
Company contributions	0.5	[1]	0.1	[1]
Benefits paid	(1.4)	[1]	(1.4)	[1]
Exchange rate changes	0	[1],[2]	0	[1],[2]
Ending fair value	14.1	[1]	14.2	[1]	13.5	[1]
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses (current liability)	0	[1]	0	[1]
Retirement benefits liability (noncurrent liability)	(5.2)	[1]	(3.2)	[1]
Net amount recognized in the Consolidated Balance Sheets	5.2	[1]	3.2	[1]
Amounts recognized in Accumulated other comprehensive income (loss):
Net actuarial (loss) gain	(9.7)	[1],[3]	(7.2)	[1],[3]
Net amount recognized in Accumulated other comprehensive income (loss)	(9.7)	[1],[3]	(7.2)	[1],[3]	(9.7)
Net (losses) gains occuring during the year	(2.8)		2.1
Pension Plans [Member]
Amounts recognized in Accumulated other comprehensive income (loss):
Net (losses) gains occuring during the year	(1.6)		(1.2)
Pension Plans [Member] | UNITED KINGDOM [Member]
Change in Benefit Obligation:
Beginning benefit obligation	62.4	[1]	59.7	[1]
Service cost	0	[1]	0	[1]	0
Interest cost	2.7	[1]	2.3	[1]	2.4
Actuarial loss (gain)	4.7	[1]	1.1	[1]
Benefits paid	(2.3)	[1]	(1.9)	[1]
Exchange rate changes	(3.8)	[1],[2]	1.2	[1],[2]
Ending benefit obligation	63.7	[1]	62.4	[1]	59.7	[1]
Change in Plan Assets:
Beginning fair value	54.9	[1]	45.6	[1]
Actual return on plan assets	3.8	[1]	7.7	[1]
Company contributions	2.3	[1]	2.2	[1]
Benefits paid	(2.3)	[1]	(1.9)	[1]
Exchange rate changes	(3.3)	[1],[2]	1.3	[1],[2]
Ending fair value	55.4	[1]	54.9	[1]	45.6	[1]
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses (current liability)	0	[1]	0	[1]
Retirement benefits liability (noncurrent liability)	(8.4)	[1]	(7.5)	[1]
Net amount recognized in the Consolidated Balance Sheets	8.4	[1]	7.5	[1]
Amounts recognized in Accumulated other comprehensive income (loss):
Net actuarial (loss) gain	2.5	[1],[3]	7.2	[1],[3]
Net amount recognized in Accumulated other comprehensive income (loss)	2.5	[1],[3]	7.2	[1],[3]	2.8
Net (losses) gains occuring during the year	(4.5)		4.4
Post-retirement Plans [Member] | CENTRAL AMERICA [Member]
Change in Benefit Obligation:
Beginning benefit obligation	50.9		52.0
Service cost	5.2		5.5		4.2
Interest cost	3.6		3.3		3.0
Actuarial loss (gain)	4.1		(5.1)
Benefits paid	(5.7)		(5.5)
Exchange rate changes	0	[2]	0.7	[2]
Ending benefit obligation	58.1		50.9		52.0
Change in Plan Assets:
Beginning fair value	0		0
Actual return on plan assets	0		0
Company contributions	5.7		5.5
Benefits paid	(5.7)		(5.5)
Exchange rate changes	0	[2]	0	[2]
Ending fair value	0		0		0
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses (current liability)	(6.2)		(6.0)
Retirement benefits liability (noncurrent liability)	(51.9)		(44.9)
Net amount recognized in the Consolidated Balance Sheets	58.1		50.9
Amounts recognized in Accumulated other comprehensive income (loss):
Net actuarial (loss) gain	(16.9)	[3]	(14.0)	[3]
Net amount recognized in Accumulated other comprehensive income (loss)	(16.9)	[3]	(14.0)	[3]	(20.4)
Net (losses) gains occuring during the year	$ (4.1)		$ 5.1

[1] The accumulated benefit obligation is the same as the projected benefit obligation.

[2] The exchange rate difference included in the reconciliation of the change in benefit obligation and the change in plan assets above results from currency fluctuations of the U.S. dollar relative to the British pound for the U.K. plan and the U.S. dollar versus Central American currencies such as the Costa Rican colon and Guatemalan quetzal for the Central American plans as of December 26, 2014 and December 27, 2013, when compared to the previous year.

[3] As of December 26, 2014 and December 27, 2013, we had accumulated other comprehensive income of $5.1 million and $3.3 million, respectively, related to tax effect of unamortized pension gains.