Recent Accounting Pronouncements - Components of Pension Cost (Income) (Detail) - Accounting Standards Update201707 - Defined Benefit and Post-retirement Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Service cost to be reported in operating income	$ 1,011	$ 1,231	$ 1,271
Components to be reported outside of operating income	(1,908)	1,008	(7,151)
Total pension cost (income)	$ (897)	$ 2,239	$ (5,880)