Income taxes - Current and Deferred Tax Provisions (Benefits) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Disclosure Income Taxes Current And Deferred Tax Provisions Benefits [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 2,200	$ 5,000	$ 5,000
Domestic, current	(2,294)	41,608	24,166
Foreign, current	32,067	24,290	22,037
State, current	4,395	6,951	4,488
Current Total	34,168	72,849	50,691
Deferred, Domestic	9,437	(10,517)	16,310
Deferred, Foreign	(10,235)	3,663	(590)
Deferred, State	11,648	(5,546)	(1,104)
Deferred, Total	10,850	(12,400)	14,616
Total, Domestic	7,143	31,067	40,476
Total, Foreign	21,832	27,977	21,447
Total, State	16,043	1,405	3,384
Total, Current and deferred tax provisions (benefits)	$ 45,018	$ 60,449	$ 65,307