Shareholders' Deficit - Assumptions Used to Calculate Fair Value of Performance-based Stock Awards Using Monte Carlo Simulation Model (Details) - Performance-Based Stock Award with a Market Condition	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%
Expected volatility	43.00%	46.00%
Risk-free interest rate	2.60%	1.50%