Stock-Based Awards - Stock-Settled Restricted Stock Units (Details) - Stock-settled Restricted Stock Units - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Restricted Stock Units (in shares):
Unvested stock-settled restricted stock units at beginning of period (in shares)	547
Granted (in shares)	256
Vested (in shares)	(273)
Forfeited (in shares)	(17)
Unvested stock-settled restricted stock units at end of period (in shares)	513	547
Unvested stock settled restricted stock units expected to vest at end of period (in shares)	477
Weighted Average Grant-Date Fair Value (in dollars per share):
Unvested stock-settled restricted stock units at beginning of period (in USD per share)	$ 27
Granted (in USD per share)	37
Vested (in USD per share)	25
Forfeited (in USD per share)	33
Unvested stock-settled restricted stock units at end of period (in USD per share)	33	$ 27
Unvested stock-settled restricted stock units expected to vest at end of period (in USD per share)	$ 33
Restricted stock units vested, intrinsic value	$ 9.6	$ 11.0	$ 12.4
Five-year vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	5 years

As of the balance sheet date, the number of restricted stock units that is expected to vest.

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As of the balance sheet date, the weighted average grant date fair value of restricted stock units that is expected to vest.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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