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Financial Instruments - Narrative (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 | Jun. 27, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Dec. 28, 2019
Investment Holdings [Line Items] |  |  |  |  |  |
Other comprehensive income before reclassifications | $ 0 |  | $ 0 | $ 1,400,000 | $ 0 |
Equity Forwards |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Equity forwards in place of common stock associated with its deferred compensation plans (in shares) | 98,700 |  |  | 98,700 |  |
Treasury locks |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Treasury lock |  | $ 300,000,000 |  |  |  |
Other comprehensive income before reclassifications |  | $ 1,400,000 |  |  |  |
Treasury locks outstanding | $ 0 |  |  | $ 0 |  | $ 0
Fair Value Hedging |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Notional amount of interest rate swaps outstanding and designated as fair value hedges | $ 100,000,000.0 |  |  | $ 100,000,000.0 |  | $ 100,000,000.0

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