Retirement Plans - Assumptions Used to Determine Benefit Obligations (Detail)	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
U.K. Plans [Member]
Net Periodic Benefit Cost Assumptions [Line Items]
Discount rate	3.90%	3.60%	4.50%
Rate of compensation increase			3.40%
CPI Inflation factor	2.00%	1.90%	2.40%
U.S. Plan [Member]
Net Periodic Benefit Cost Assumptions [Line Items]
Discount rate	4.00%	3.90%	4.40%