Accrued Payroll and Employee Benefits (Detail) - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 29, 2017
Employee Related Liabilities [Line Items]
Accrued bonuses payable	$ 49,436	$ 44,752
Accrued 401(k) contributions	8,154	7,691
Accrued vacation	10,390	9,707
Deferred compensation plan	6,641	6,274
Other accrued payroll and employee benefits	2,234	1,640
Total accrued payroll and employee benefits	$ 76,855	$ 70,064