Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 29, 2018	Dec. 30, 2017	Dec. 29, 2018
Operating Loss Carryforwards [Line Items]
Deferred tax benefit, remeasurement of deferred tax assets and liabilities		$ 45,400
Transition tax		100
Measurement period adjustment	$ 500
Charitable contributions carryforward		2,839	$ 712
Unrecognized tax benefits that would impact effective tax rate		$ 2,500	2,900
Undistributed earnings of foreign subsidiaries			34,500
Income tax on repatriation of foreign earnings			20
U.S. state
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards			500
Tax credit carryforward, amount			$ 2,200
Tax credit carryforward expiration period			20 years
Valuation Allowance of Deferred Tax Assets
Operating Loss Carryforwards [Line Items]
Valuation allowances and reserves decrease			$ (1,500)