Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 29, 2018

Summary Of Significant Accounting Policies [Abstract]

Schedule Of Assets And Liabilities Measured At Fair Value

		Fair Value Measurements Using
		Inputs
	December 30,  2017	Level 1	Level 2	Level 3
Money market funds included in cash equivalents	$                106,090	$       106,090	$                  -	$                  -
Foreign currency contracts included in other current liabilities	(139)	-	(139)	-
	$                105,951	$       106,090	$             (139)	$                  -
		Fair Value Measurements Using
		Inputs
	December 29,  2018	Level 1	Level 2	Level 3
Money market funds included in cash equivalents	$                129,449	$       129,449	$                  -	$                  -
Foreign currency contracts included in other current liabilities	(309)	-	(309)	-
	$                129,140	$       129,449	$             (309)	$                  -

Schedule Of Contract Liabilities From Contract With Customers

	As of
	December 29,
	2018
Contract liabilities at beginning of period	$                  14,417
Increase due to deferral of revenue at period end	15,055
Decrease due to beginning contract liabilities recognized as revenue	(14,417)
Contract liabilities at end of period	$                  15,055