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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

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