Company Contributions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Defined Contribution and Defined Benefit Plans [Line Items]
Expected company contribution	$ 1,041
Pension plans
Defined Contribution and Defined Benefit Plans [Line Items]
Contribution of company to company pension plans	40,971	$ 1,891	$ 1,341
401K (DC Plan)
Defined Contribution and Defined Benefit Plans [Line Items]
Contribution of company to company pension plans	1,308	376	841
Required | Pension plans
Defined Contribution and Defined Benefit Plans [Line Items]
Contribution of company to company pension plans	271	286	341
Discretionary | Pension plans
Defined Contribution and Defined Benefit Plans [Line Items]
Contribution of company to company pension plans	$ 40,700	$ 1,605	$ 1,000