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		12 Months Ended
		Dec. 30, 2016		Jan. 01, 2016		Dec. 26, 2014
Change in Plan Assets:
Beginning fair value		$ 13.4
Ending fair value		13.1		$ 13.4
Amounts recognized in Accumulated other comprehensive income (loss):
Net gains occurring during the year		5.2		4.2
Central America
Amounts recognized in Accumulated other comprehensive income (loss):
Net gains occurring during the year		0.8		0.8		$ 0.9
United Kingdom
Change in Plan Assets:
Beginning fair value		53.4
Ending fair value		50.5		53.4
US Pension Plans
Change in Benefit Obligation:
Beginning benefit obligation	[1]	17.6		19.3
Service cost		0.0	[1]	0.0	[1]	0.0
Interest cost		0.7	[1]	0.7	[1]	0.7
Actuarial loss (gain)	[1]	0.1		(1.0)
Benefits paid	[1]	(1.4)		(1.4)
Exchange rate changes	[1],[2]	0.0		0.0
Ending benefit obligation	[1]	17.0		17.6		19.3
Change in Plan Assets:
Beginning fair value	[1]	13.4		14.1
Actual return on plan assets	[1]	0.8		(0.1)
Company contributions	[1]	0.3		0.8
Benefits paid	[1]	(1.4)		(1.4)
Exchange rate changes	[1],[2]	0.0		0.0
Ending fair value	[1]	13.1		13.4		14.1
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses (current liability)	[1]	0.0		0.0
Retirement benefits liability (noncurrent liability)	[1]	3.9		4.1
Net amount recognized in the Consolidated Balance Sheets	[1]	3.9		4.1
Amounts recognized in Accumulated other comprehensive income (loss):
Net actuarial (loss) gain	[1],[3]	(9.4)		(9.3)
Net amount recognized in accumulated other comprehensive income (loss)		(9.4)	[1],[3]	(9.3)	[1],[3]	(9.7)
Net gains occurring during the year		0.4		0.0
Pension Plans
Amounts recognized in Accumulated other comprehensive income (loss):
Net gains occurring during the year		2.2		1.7
Pension Plans | United Kingdom
Change in Benefit Obligation:
Beginning benefit obligation	[1]	58.8		63.7
Service cost		0.0	[1]	0.0	[1]	0.0
Interest cost		1.9	[1]	2.2	[1]	2.7
Actuarial loss (gain)	[1]	10.8		(1.5)
Benefits paid	[1]	(4.3)		(2.3)
Exchange rate changes	[1],[2]	(10.2)		(3.3)
Ending benefit obligation	[1]	57.0		58.8		63.7
Change in Plan Assets:
Beginning fair value	[1]	53.4		55.4
Actual return on plan assets	[1]	8.7		1.1
Company contributions	[1]	1.9		2.2
Benefits paid	[1]	(4.3)		(2.3)
Exchange rate changes	[1],[2]	(9.2)		(3.0)
Ending fair value	[1]	50.5		53.4		55.4
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses (current liability)	[1]	0.0		0.0
Retirement benefits liability (noncurrent liability)	[1]	6.5		5.5
Net amount recognized in the Consolidated Balance Sheets	[1]	6.5		5.5
Amounts recognized in Accumulated other comprehensive income (loss):
Net actuarial (loss) gain	[1],[3]	(2.8)		2.1
Net amount recognized in accumulated other comprehensive income (loss)		(2.8)	[1],[3]	2.1	[1],[3]	2.5
Net gains occurring during the year		4.7		0.3
Post-retirement Plans | Central America
Change in Benefit Obligation:
Beginning benefit obligation		57.8		58.1
Service cost		5.2		5.8		5.2
Interest cost		3.8		3.7		3.6
Actuarial loss (gain)		1.3		(1.6)
Benefits paid		(6.3)		(8.1)
Exchange rate changes	[2]	0.1		(0.1)
Ending benefit obligation		61.9		57.8		58.1
Change in Plan Assets:
Beginning fair value		0.0		0.0
Actual return on plan assets		0.0		0.0
Company contributions		6.3		8.1
Benefits paid		(6.3)		(8.1)
Exchange rate changes	[2]	0.0		0.0
Ending fair value		0.0		0.0		0.0
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses (current liability)		7.2		6.7
Retirement benefits liability (noncurrent liability)		54.7		51.1
Net amount recognized in the Consolidated Balance Sheets		61.9		57.8
Amounts recognized in Accumulated other comprehensive income (loss):
Net actuarial (loss) gain	[3]	(14.6)		(14.1)
Net amount recognized in accumulated other comprehensive income (loss)		(14.6)	[3]	(14.1)	[3]	$ (16.9)
Net gains occurring during the year		$ 1.3		$ (1.6)

[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 30, 2016 and January 1, 2016, when compared to the previous year.

[3] 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.