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Share based compensation arrangement by share based payment award grant target performance percentage.

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Share Based Compensation Arrangement By Share Based Payment Award Minimum Employee Subscription Rate

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Share based compensation arrangement by share based payment award number of shares available for future issuance.

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Share based compensation arrangement by share based payment award reduced number of shares available for issuance.

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- Definition

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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Aggregate number of common shares reserved for future issuance.

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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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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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Discount rate from fair value on offering date that participants pay for shares.

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- Definition

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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- Definition

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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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 highest percentage of annual salary that an employee is permitted to utilize with respect to the 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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- Definition

Net number of share options (or share units) granted during the period.

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- Definition

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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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. 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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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- Definition

Number of share options (or share units) exercised during the current period.

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Share-based Compensation - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Sep. 30, 2017	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016	Dec. 29, 2017	Dec. 30, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award number of shares authorized			20,000,000
Number of shares available for issuance for each share issued			2
Shares available for future issuance			2,432,533
Share-based compensation expense			$ 22,900,000	$ 9,400,000	$ 10,300,000
Income tax benefit recognized related to share-based compensation			$ 500,000	2,800,000	2,700,000
Share Based compensation award vesting period			3 years
Closing price of common shares						$ 16.66	$ 11.33	$ 10.99
Cash received from exercise of stock options			$ 1,600,000	1,700,000
Tax benefit realized on exercise of stock option			0	1,300,000
Fair value of options that vested			16,400,000	1,600,000	$ 1,500,000
Options exercised, Shares					500,000
Income Loss form Discontinued Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			1,200,000
Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 12,000,000	$ 1,300,000	$ 4,900,000
Awarded			235,000	835,000	320,000
Aggregate grant date fair value of shares vested			$ 2,600,000	$ 0	$ 1,800,000
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 4,200,000	$ 3,300,000	$ 2,400,000
Awarded			135,000	503,000	213,000
Aggregate grant date fair value of shares vested			$ 4,300,000	$ 12,300,000	$ 100,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable period		3 years	7 years 9 months 18 days
Share-based compensation expense			$ 5,500,000	$ 3,700,000	$ 1,900,000
Stock options granted, shares			734,000	2,976,000	684,000
Options granted, exercise price per share			$ 17.50	$ 11.15	$ 9.22
Options exercised, Shares			169,000	238,000	113,000
2010 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 1,100,000
Awarded			84,060
2010 Equity Incentive Plan [Member] \| Performance-Based RSUs [Member] \| Condition One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded			33,030
2010 Equity Incentive Plan [Member] \| Performance-Based RSUs [Member] \| Condition Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded			202,269
2010 Equity Incentive Plan [Member] \| Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based compensation award vesting period				3 years
Equity based awards, vesting description			Additionally, in 2016, we granted 33,030 Performance-based RSUs, which vest on the last day of our 2019 fiscal year, and 202,269 Performance-based RSUs, which vest on the last day of our 2020 fiscal year. The number of shares ultimately awarded will be based upon the performance percentage, which can range from 0% to 200% of the awards granted. The Performance-based RSUs vest primarily on the Company’s achievement of a specified level of cumulative pre-tax income for the applicable performance period. The number of Performance-based RSUs that may vest and the related unrecognized compensation cost is subject to change based on the level of targeted pre-tax income that is achieved during the vesting period. The Company also granted 134,840 Time-based RSUs, which vest in three equal annual installments on the first, second and third anniversaries of the date of grant and are based upon a service condition.
Awarded				134,840
2010 Equity Incentive Plan [Member] \| Time-Based RSUs [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance awards granted			0.00%
2010 Equity Incentive Plan [Member] \| Time-Based RSUs [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance awards granted			200.00%
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based compensation award vesting period			3 years
Equity based awards, vesting description			Stock options granted during the year ended December 30, 2017 vest in three equal annual installments on the first, second and third anniversaries of the date of grant.
Stock Option Plan [Member] \| Certain Employee [Member] \| Exercise Price of $9.22 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, shares			734,500
Options granted, exercise price per share			$ 17.50
Options granted, estimated fair value			$ 4.82
Stock Option Plan [Member] \| Certain Employee [Member] \| Exercise Price of $9.22 [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based compensation award vesting period			10 years
Stock Option Plan [Member] \| Certain Employee [Member] \| Exercise Price of $8.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, shares				2,975,500
Options granted, exercise price per share				$ 11.15
Options granted, estimated fair value				$ 2.84
Stock Option Plan [Member] \| Certain Employee [Member] \| Exercise Price of $8.00 [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based compensation award vesting period				10 years
Stock Option Plan [Member] \| Certain Employee [Member] \| Exercise Price of $9.29 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, shares					684,000
Options granted, exercise price per share					$ 9.22
Options granted, estimated fair value					$ 4.31
Stock Option Plan [Member] \| Certain Employee [Member] \| Exercise Price of $9.29 [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based compensation award vesting period					10 years
Employees Share Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award number of shares authorized	3,000,000
Share-based compensation expense	$ 100,000		$ 100,000	$ 200,000	$ 100,000
Share based payment award offering price percentage	90.00%
Payroll deduction to purchase share, Minimum	1.00%
Payroll deduction to purchase share, Maximum	15.00%
Common Stock Capital Shares Reserved for Future issuance			2,735,506