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Stock Based Compensation (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance		1,798,440
Performance based stock option grant	2,916,563
Share based compensation		$ 9,310	$ 10,316	$ 8,765
Stock Appreciation Rights (SARs) And Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period		4 years
Stock Appreciation Rights (SARs) And Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period		10 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, vesting schedules options one		4 years
Percentage of vesting on restricted stock, option one, Second anniversary		50.00%
Percentage of vesting on restricted stock, option one, Third anniversary		25.00%
Percentage of vesting on restricted stock, option one, Fourth anniversary		25.00%
Restricted stock units, vesting schedules options two		4 years
Percentage of vesting on restricted stock, option two, First anniversary		25.00%
Percentage of vesting on restricted stock, option two, Second anniversary		25.00%
Percentage of vesting on restricted stock, option two, Third anniversary		25.00%
Percentage of vesting on restricted stock, option two, Fourth anniversary		25.00%
Restricted stock units, vesting schedules options three		3 years
Percentage of vesting on restricted stock, option three, First anniversary		33.00%
Percentage of vesting on restricted stock, option three, Second anniversary		33.00%
Percentage of vesting on restricted stock, option three, Third anniversary		33.00%
Share based compensation		$ 7,300	7,800	7,600
Compensation expense related to unvested restricted stock unit based awards		$ 8,900
Weighted average period, Restricted stock units		2 years 6 months
Common Stock Subject to Vesting Requirements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period		4 years
Share based compensation		$ 2,000	2,500	$ 1,200
Compensation expense related to common stock subject to vesting requirements		$ 2,200
Weighted average period, Common stock		2 years 2 months 12 days
Common Stock Subject to Vesting Requirements [Member] | Jibe Consulting Inc and Technolab International Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid		$ 100	$ 3,600

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