Retirement and Other Employee Benefits (Amounts of AOCI Expected to be Amortized as a Component of Net Period Cost) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012	Dec. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
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
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax		(3.3)	(4.8)
Defined contribution plan expense		1.1	1.1	1.0
CENTRAL AMERICA [Member]
Defined Benefit Plan Disclosure [Line Items]
2012 Amortization of net losses (gains)	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax		(0.9)	(0.6)	(0.9)
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax		3.7	4.1
Pension Plans [Member] | CENTRAL AMERICA [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension costs		0.3	0.3	0.3
UNITED STATES Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2012 Amortization of net losses (gains)	(0.3)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax		(2.1)	1.0
Net periodic pension costs		0.1	0.1	0.1
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
2012 Amortization of net losses (gains)	0
Post-retirement Plans [Member] | CENTRAL AMERICA [Member]
Defined Benefit Plan Disclosure [Line Items]
2012 Amortization of net losses (gains)	(1.0)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax		(5.1)	6.9
Net periodic pension costs		$ 10.4	$ 8.3	$ 7.8
Oil and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio of stocks invested, industry concentration		16.00%
Materials Businesses [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio of stocks invested, industry concentration		13.00%
Consumer Goods [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio of stocks invested, industry concentration		12.00%
Industrial [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio of stocks invested, industry concentration		11.00%
Other Industries [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio of stocks invested, industry concentration		25.00%
Financial Institutions [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio of stocks invested, industry concentration		23.00%