XML 79 R65.htm IDEA: XBRL DOCUMENT v3.10.0.1
Shareholders' Equity - Assumptions Used to Calculate Fair Value of Options Granted Using Black-Scholes-Merton Option-Pricing Model (Details) - Employee Stock Option
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield 0.00% 0.00% 0.00%
Expected volatility 43.00% 46.00% 50.00%
Risk-free interest rate 2.70% 2.00% 1.40%
Expected term (in years) 5 years 5 years 1 month 6 days 5 years 2 months 12 days