Retirement and Other Employee Benefits (Roll Forward of AOCI Balances) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 26, 2014		Dec. 27, 2013		Dec. 28, 2012
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
Net (losses) gains occuring during the year	$ 5.1		$ 3.3
CENTRAL AMERICA [Member]
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
Net (losses) gains occuring during the year	0.8		0.9		0.9
UNITED STATES Pension Plans [Member]
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
AOCI (loss) gain at beginning of plan year	(7.2)	[1],[2]	(9.7)
Net losses (gains) recognized during the year	0.3		0.4
Net (losses) gains occuring during the year	(2.8)		2.1
Currency exchange rate changes	0		0
AOCI gain (loss) at end of plan year	(9.7)	[1],[2]	(7.2)	[1],[2]
Pension Plans [Member]
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
Net (losses) gains occuring during the year	(1.6)		(1.2)
Pension Plans [Member] | UNITED KINGDOM [Member]
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
AOCI (loss) gain at beginning of plan year	7.2	[1],[2]	2.8
Net losses (gains) recognized during the year	(0.1)		0
Net (losses) gains occuring during the year	(4.5)		4.4
Currency exchange rate changes	(0.1)		0
AOCI gain (loss) at end of plan year	2.5	[1],[2]	7.2	[1],[2]
Post-retirement Plans [Member] | CENTRAL AMERICA [Member]
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
AOCI (loss) gain at beginning of plan year	(14.0)	[2]	(20.4)
Net losses (gains) recognized during the year	0.9		1.6
Net (losses) gains occuring during the year	(4.1)		5.1
Currency exchange rate changes	0.3		(0.3)
AOCI gain (loss) at end of plan year	$ (16.9)	[2]	$ (14.0)	[2]

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

[2] 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.