Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 29, 2018	Dec. 30, 2017
Current assets:
Allowance for doubtful accounts	$ 579	$ 714
Shareholders’ (deficit) equity:
Undesignated preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Undesignated preferred stock, shares issued (in shares)	0	0
Undesignated preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	142,500,000	142,500,000
Common stock, shares issued (in shares)	33,216,000	38,813,000
Common stock, shares outstanding (in shares)	33,216,000	38,813,000