Exercise prices for options outstanding.

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The percentage of options exercisable granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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No definition available.

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Percentage of non vesting of share-based compensation awards.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The percentage rate used to calculate dividend payments on preferred stock.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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The maximum number of shares (or other type of equity) that have been approved for issuance in the equity-based payment transaction.

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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 for vested portions of options outstanding and currently exercisable or convertible, 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 for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Shareholders' Equity and Stock-Based Compensation (Details Textual) - USD ($)	12 Months Ended
	Dec. 27, 2018	Dec. 28, 2017	Dec. 29, 2016
Preferred Stock, Dividend Rate, Percentage	110.00%
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	11,687,500
Stock Repurchased During Period, Shares	82,722	28,898	333,827
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	2,786,700
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance	4,937,500
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	750,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	435,726
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	887,191
Allocated Share-based Compensation Expense	$ 2,691,000	$ 2,411,000	$ 1,899,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 2,617,000	1,227,000	840,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	1,389,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 21.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 24,340,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	25,048,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	15,817,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	10,373,000	$ 1,770,000	$ 1,676,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 4,297,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 10 months 24 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 2,676,000
Minimum [Member]
Exercise Price for Options Outstanding	$ 10.00
Maximum [Member]
Exercise Price for Options Outstanding	$ 41.35
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	3 years 2 months 12 days
After Two Years [Member]
Sharebased Compensation Arrangement by Sharebased Payment Award Award Non Vesting Rights Percentage	50.00%
After Two Years [Member] \| Option One [Member]
Share Based Compensation Arrangement By Share Based Payment Award Options Grants in Period Exercisable Percentage	40.00%
After Two Years [Member] \| Option Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award Options Grants in Period Exercisable Percentage	50.00%
After Three Years [Member] \| Option One [Member]
Share Based Compensation Arrangement By Share Based Payment Award Options Grants in Period Exercisable Percentage	60.00%
Sharebased Compensation Arrangement by Sharebased Payment Award Award Non Vesting Rights Percentage	25.00%
After Three Years [Member] \| Option Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award Options Grants in Period Exercisable Percentage	75.00%
Sharebased Compensation Arrangement by Sharebased Payment Award Award Non Vesting Rights Percentage	50.00%
After Four Years [Member] \| Option One [Member]
Share Based Compensation Arrangement By Share Based Payment Award Options Grants in Period Exercisable Percentage	80.00%
After Four Years [Member] \| Option Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award Options Grants in Period Exercisable Percentage	100.00%
Sharebased Compensation Arrangement by Sharebased Payment Award Award Non Vesting Rights Percentage	100.00%
After Five Years [Member]
Share Based Compensation Arrangement By Share Based Payment Award Options Grants in Period Exercisable Percentage	100.00%
After Five Years [Member] \| Option One [Member]
Sharebased Compensation Arrangement by Sharebased Payment Award Award Non Vesting Rights Percentage	50.00%
After Five Years [Member] \| Option Two [Member]
Sharebased Compensation Arrangement by Sharebased Payment Award Award Non Vesting Rights Percentage	100.00%
After Ten Years [Member] \| Option One [Member]
Sharebased Compensation Arrangement by Sharebased Payment Award Award Non Vesting Rights Percentage	75.00%
Upon Retirement [Member] \| Option One [Member]
Sharebased Compensation Arrangement by Sharebased Payment Award Award Non Vesting Rights Percentage	100.00%