Retirement and Other Employee Benefits - Roll Forward of AOCI Balances (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2016		Jan. 01, 2016		Dec. 26, 2014
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
Net (losses) gains occurring during the year	$ (5.2)		$ (4.2)
Central America
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
Net (losses) gains occurring during the year	(0.8)		(0.8)		$ (0.9)
US Pension Plans
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
AOCI (loss) gain at beginning of plan year	(9.3)	[1],[2]	(9.7)
Amortization of net losses recognized during the year	0.3		0.4
Net (losses) gains occurring during the year	(0.4)		0.0
Currency exchange rate changes	0.0		0.0
AOCI (loss) gain at end of plan year	(9.4)	[1],[2]	(9.3)	[1],[2]	(9.7)
Pension Plans
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
Net (losses) gains occurring during the year	(2.2)		(1.7)
Pension Plans | United Kingdom
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
AOCI (loss) gain at beginning of plan year	2.1	[1],[2]	2.5
Amortization of net losses recognized during the year	0.0		0.0
Net (losses) gains occurring during the year	(4.7)		(0.3)
Currency exchange rate changes	(0.2)		(0.1)
AOCI (loss) gain at end of plan year	(2.8)	[1],[2]	2.1	[1],[2]	2.5
Post-retirement Plans | Central America
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]
AOCI (loss) gain at beginning of plan year	(14.1)	[2]	(16.9)
Amortization of net losses recognized during the year	0.8		1.2
Net (losses) gains occurring during the year	(1.3)		1.6
Currency exchange rate changes	0.0		0.0
AOCI (loss) gain at end of plan year	$ (14.6)	[2]	$ (14.1)	[2]	$ (16.9)

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

[2] We had accumulated other comprehensive income of $5.2 million as of December 30, 2016 and $4.2 million as of January 1, 2016 related to tax effect of unamortized pension gains.