Share Plans (Schedule of Restricted Share Unit Activity) (Details) - $ / shares	12 Months Ended
Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period to recognize unrecognized compensation cost, share options	2 years 3 months 18 days
Restricted Share Unit Activity [Roll Forward]
Beginning balance	1,685,101	1,105,766	883,462
Granted	755,180	1,222,568	655,282
Exercised	(713,274)	(433,354)	(263,189)
Expired/Forfeited	(307,987)	(209,879)	(169,789)
Ending balance	1,419,020	1,685,101	1,105,766
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average grant date fair value, restricted share units	$ 22.68	$ 29.54	$ 60.08	$ 71.03
Weighted-average grant date fair value, granted restricted share units	20.13	14.58	50.74
Weighted-average grant date fair value, vested restricted share units	35.29	57.93	69.14
Weighted-average grant date fair value, forfeited restricted share units	$ 24.81	$ 44.38	$ 68.57
Restricted Stock
Restricted Share Unit Activity [Roll Forward]
Beginning balance	0	4,675	14,868
Exercised		(3,970)	(7,970)
Expired/Forfeited		(705)	(2,223)
Ending balance		0	4,675
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average grant date fair value, granted restricted share units	$ 70.88

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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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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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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