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Reconciliation of Average Number of Common Shares and Common Share Equivalents Outstanding (Detail) - shares
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]      
Average number of common shares outstanding 41,273,000 41,938,000 42,112,000
Incremental shares from assumed exercises of stock options 37,000 86,000 124,000
Average number of common shares and common share equivalents outstanding 41,310,000 42,024,000 42,236,000