Restructuring - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Sep. 27, 2014 USD ($)	Jun. 28, 2014 USD ($)	Mar. 29, 2014 USD ($) Plant	Jan. 02, 2016 USD ($)	Jan. 03, 2015 USD ($)	Dec. 28, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Charges related primarily to employee redundancy costs	$ 100,000	$ 100,000	$ 2,200,000		$ 2,400,000	$ 2,000,000
Asset impairment charges	$ (200,000)	$ 300,000	$ 1,600,000		1,700,000	0
Amount owed under restructuring plan					$ 0	$ 0
2014 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Number of plants to be closed | Plant			2
Charges related primarily to employee redundancy costs			$ 4,100,000	$ 0
2014 Restructuring Plan [Member] | North America [Member]
Restructuring Cost and Reserve [Line Items]
Number of plants to be closed | Plant			1
2014 Restructuring Plan [Member] | United Kingdom [Member]
Restructuring Cost and Reserve [Line Items]
Number of plants to be closed | Plant			1