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Shares Repurchased Under Stock Repurchase Plan (Detail) - USD ($)
$ in Thousands
4 Months Ended 12 Months Ended 192 Months Ended
Apr. 21, 2018
Dec. 29, 2018
Dec. 29, 2018
Equity [Abstract]      
Total Number of Shares Purchased 120,147 120,147 68,000,000
Total Cost of Shares Purchased $ 2,489 $ 2,489 $ 635,600