Retirement and Other Employee Benefits (Fair Values of Plan Assets by Asset Category) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 27, 2013		Dec. 28, 2012		Dec. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	$ 14.3		$ 13.6
US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			0.1
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	3.5		4.8
Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	1.0		0.1
Value Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	5.7		4.3
Growth Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	4.1		3.6
Commodity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			0.7
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	14.3		13.5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	3.5		4.8
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	1.0		0.1
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Value Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	5.7		4.3
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Growth Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	4.1		3.6
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			0.7
Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0.1
Significant Observable Inputs (Level 2) [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			0.1
Significant Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Observable Inputs (Level 2) [Member] | Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Observable Inputs (Level 2) [Member] | Value Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Observable Inputs (Level 2) [Member] | Growth Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Observable Inputs (Level 2) [Member] | Commodity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			0
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Value Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Growth Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Commodity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			0
UNITED STATES Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	14.2	[1]	13.5	[1]	12.2	[1]
UNITED KINGDOM [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	54.9		45.6
UNITED KINGDOM [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.7		0.6
UNITED KINGDOM [Member] | United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	23.1		18.8
UNITED KINGDOM [Member] | United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	7.6		5.5
UNITED KINGDOM [Member] | Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	12.5		10.9
UNITED KINGDOM [Member] | United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	4.8		4.8
UNITED KINGDOM [Member] | United Kingdom Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	6.2		5.0
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	54.9		45.6
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.7		0.6
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	23.1		18.8
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	7.6		5.5
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	12.5		10.9
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	4.8		4.8
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | United Kingdom Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	6.2		5.0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | United Kingdom Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | United Kingdom Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	$ 54.9	[1]	$ 45.6	[1]	$ 39.3	[1]

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