Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income taxes computed at U.S. statutory rate	$ 15,153	$ 10,197	$ 1,949
State income taxes	227	223	28
Foreign tax rate differential	794	3,502	342
Change in valuation allowance	1,490	(25,738)	1,648
Equity compensation	(1,803)	380	311
Tax credits	(2,336)	(3,191)	(1,834)
Domestic production activities deduction	(608)	(354)
Liabilities for uncertain tax positions	18	67	74
Other, net	161	14	145
Provision (benefit) for income taxes	$ 13,096	$ (14,900)	$ 2,663