Loss Per Share (Narrative) (Details) - shares	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Common shares issuable on an if-converted basis adjusted to diluted EPS	11,333,333
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,528,899	2,384,249	2,540,189
Stock Options And Restricted Stock Units [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	370,670	452,316	815,952