Company Contributions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Defined Contribution and Defined Benefit Plans [Line Items]
Expected company contribution	$ 680
Pension plans
Defined Contribution and Defined Benefit Plans [Line Items]
Contribution of company to company pension plans	1,891	$ 1,341	$ 10,436
401K (DC Plan)
Defined Contribution and Defined Benefit Plans [Line Items]
Contribution of company to company pension plans	376	841	674
Required | Pension plans
Defined Contribution and Defined Benefit Plans [Line Items]
Contribution of company to company pension plans	286	341	436
Discretionary | Pension plans
Defined Contribution and Defined Benefit Plans [Line Items]
Contribution of company to company pension plans	$ 1,605	$ 1,000	$ 10,000