Commitments and Contingencies - Additional Information (Detail) £ in Millions, $ in Millions			3 Months Ended		12 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2014 GBP (£)	Oct. 01, 2016 USD ($)	Oct. 01, 2016 GBP (£)	Dec. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 02, 2016 USD ($)	May 31, 2014 GBP (£)
Operating Leased Assets [Line Items]
Sublease income					$ 0.7
Purchase commitments					135.5
Maximum potential amount of undiscounted future payments under the guarantee					42.0
ABL Facility [Member]
Operating Leased Assets [Line Items]
Standby letters of credit outstanding					$ 46.0	$ 42.4	$ 45.6
Lease Agreements One [Member]
Operating Leased Assets [Line Items]
Lease agreement maturity period					2027
Lease Agreements Two [Member]
Operating Leased Assets [Line Items]
Lease agreement maturity period					2028
Lease Agreements Three [Member]
Operating Leased Assets [Line Items]
Lease agreement maturity period					2029
Capital Commitments [Member]
Operating Leased Assets [Line Items]
Purchase commitments					$ 0.1
Aimia Foods Holdings Limited [Member]
Operating Leased Assets [Line Items]
Deferred consideration	$ 33.5	£ 19.9
Contingent consideration maximum payable amount | £								£ 16.0
Aggregate contingent consideration liability | £				£ 12.0
Existing receivable | £				3.9
Final total cash payment			$ 10.8	£ 8.1