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Weighted-Average Shares (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Earnings Per Share [Abstract]        
Stock options to purchase anti-dilutive common stock 6,113,000 2,959,000 5,503,000 2,032,000