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Share-Based Compensation - Fair Value of Share Option Award Based on Weighted-Average Assumptions (Detail)
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jul. 01, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Risk-free interest rate 2.90% 2.60%
Expected term 5 years 1 month 6 days 5 years 1 month 6 days
Expected volatility 48.00% 48.00%
Expected dividend yield 7.50% 9.50%