Benefit Plans - Assumptions Used to Determine Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%	5.40%	5.80%
Expected long-term rate of return on plan assets	5.70%	6.90%	7.20%
Inflation factor	3.30%	3.70%	3.70%
U.S. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.50%	4.10%	5.70%
Expected long-term rate of return on plan assets	7.00%	7.00%	7.00%