Benefit Plans - Schedule of Pension Plan Weighted-Average Asset Allocations by Asset Category (Detail)	Dec. 28, 2013	Dec. 29, 2012
U.K. Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	59.20%	59.00%
U.K. Plans [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	37.80%	40.60%
U.K. Plans [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	3.00%	0.40%
U.S. Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	67.00%	65.20%
U.S. Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	32.40%	32.40%
U.S. Plan [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	0.60%	2.30%