The number of tranches in which shares are granted.

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The upper limit percentage of the number of performance stock awards granted in current year that may be earned by the recipient if the Company achieves the stated targets.

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The lower limit percentage of the number of performance stock awards granted in current year that may be earned by the recipient if the Company achieves the stated targets.

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Net number of share options (or share units) granted, the receipt of which has been deferred to a certain future date.

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Adjustment to shares granted relative to vested stock performance awards for 3 year periods that have performed below or above 100% of target.

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The total number of shares awarded to employee by employment agreement that are to be granted across more than one grant date.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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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 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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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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Number of shares issued under share-based payment arrangement.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock Options, Other Stock Awards and Warrants - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 27, 2020 USD ($) $ / shares shares	Dec. 29, 2019 USD ($) $ / shares shares	Dec. 30, 2018 USD ($) $ / shares shares	Dec. 28, 2014 tranche shares	Dec. 29, 2013 shares	Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares) \| shares	12,344
Compensation expense (income)	$ 49,748	$ 28,044	$ 27,892
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plans, vesting period	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plans, vesting period	5 years
Stock performance awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	$ 8,415	$ (1,573)	$ 842
Percentage of target number of shares, range lower limit	0.00%
Percentage of target number of shares, range upper limit	200.00%
Additional shares granted (in shares) \| shares			14
Share-based payment arrangement, nonvested award, cost not yet recognized, amount	$ 18,601
Weighted average period for recognition of total unrecognized compensation expense	21 months
Granted (in shares) \| shares	352	281	250
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	$ 28,529	$ 18,744	$ 17,897
Share-based payment arrangement, nonvested award, cost not yet recognized, amount	$ 69,064
Weighted average period for recognition of total unrecognized compensation expense	24 months
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	$ 28,529	$ 18,744	$ 17,897
Granted (in shares) \| shares	841	259	257
Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	$ 10,958	$ 9,113	$ 7,393
Share-based payment arrangement, nonvested award, cost not yet recognized, amount	$ 15,181
Weighted average period for recognition of total unrecognized compensation expense	22 months
Share-based compensation arrangement by share-based payment award, options (in shares) \| shares	2,862	2,444	2,310			2,579
Exercisable (in shares) \| shares	1,451	1,284	1,391
Weighted average remaining contractual term for outstanding options	4 years 3 months 3 days
Weighted average remaining contractual term for exercisable options		2 years 11 months 4 days
Share-based compensation arrangement by share-based payment award, options, outstanding, intrinsic value	$ 21,131
Share-based compensation arrangement by share-based payment award, options, exercisable, amount	$ 16,149
Share-based compensation arrangement by share-based payment award, options, grants in period (in dollars per share) \| $ / shares	$ 18.58	$ 15.70	$ 19.26
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value	$ 9,721	$ 24,483	$ 38,909
Stock Options Non Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	$ 1,846	$ 1,760	$ 1,760
Granted (in shares) \| shares	29	18	20
Number of deferred shares (in shares) \| shares	19	10	11
Chief executive officer \| Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares prescribed by employment agreement (in shares) \| shares				587	587
Shares issued from employee agreement (in shares) \| shares			587
Number of tranches \| tranche				2