Accrued Payroll and Employee Benefits (Detail) - USD ($) $ in Thousands	Jan. 03, 2020	Dec. 28, 2018
Employee Related Liabilities Current [Abstract]
Accrued bonuses payable	$ 54,471	$ 49,436
Accrued 401(k) contributions	8,878	8,154
Accrued vacation	10,896	10,390
Deferred compensation plan	7,984	6,641
Other accrued payroll and employee benefits	4,494	2,234
Total accrued payroll and employee benefits	$ 86,723	$ 76,855