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Financial Instruments - Narrative (Detail) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Sep. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Equity Forwards |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity forwards in place of common stock associated with its deferred compensation plans (in shares) |  | 108,000 |  |
Treasury locks |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Treasury locks outstanding |  | $ 0 | $ 0 | $ 300,000,000
Treasury locks settled | $ 300,000,000 |  |  |
Gain on the settlement of the treasury lock | $ 13,300,000 |  |  |
Fair Value Hedging |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Notional amount of interest rate swaps outstanding and designated as fair value hedges |  | $ 100,000,000 | $ 100,000,000 |

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