Excess tax benefit from share based compensation.

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Represents the award target range.

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Percentage Of Target To Be Achieved To Be Eligible To Receive Performance Awards

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Represents the performance period for measurement of achievement of differing levels of performance for a performance based award of the entity.

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Sharebased compensation arrangement by sharebased payment award equity instruments other than options aggregate fair value unvested outstanding.

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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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- Definition

Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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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- Definition

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

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- Definition

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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- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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- Definition

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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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

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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No definition available.

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- Definition

Number of options vested.

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No definition available.

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- Definition

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

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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended	12 Months Ended
	Jan. 26, 2018	Jan. 27, 2017	Jan. 22, 2016	Jan. 23, 2015	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized						100,000,000	100,000,000
Common stock, par value per share						$ 0.00001	$ 0.00001
Stock-based compensation expense						$ 6,322	$ 3,341	$ 1,488
Reduction in income tax expense related to stock based compensation						1,000	800
Cash received from the exercise of stock options						$ 2,900	$ 385
Exercise of stock options						1,185,745	132,900	0
Expired of stock options						62,871	10,000	86,000
Tax benefit recognized from stock option exercises						$ 1,000	$ 800
Ex Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Severance costs					$ 1,400
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period						3 years
Performance Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)						107,309	176,632	475,409
Percentage of target to be achieved to be eligible to receive performance awards						108.50%	96.50%	135.00%
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)						600,206	410,694	917,283
Fair value, per unit		$ 15.50	$ 10.77
Unrecognized compensation expense						$ 11,100	$ 2,500
Recognition period of unrecognized compensation cost						11 months 1 day	1 year 4 months 28 days
Weighted average remaining life						11 months 1 day	1 year 4 months 28 days	2 years 1 month 13 days
Aggregate fair value						$ 19,350	$ 6,330	$ 3,400
Restricted Stock Units (RSUs) \| Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)		298,761	367,519	685,606
Fair value, per unit				$ 4.03
Restricted Stock Units (RSUs) \| Executive Officer \| Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)	353,897
Fair value, per unit	$ 32.52
Restricted Stock Units (RSUs) \| Ex Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense					$ 500
Vested					167,511
Restricted Stock Units (RSUs) \| Non Employee Board
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)		46,282	34,920	89,900
Fair value, per unit				$ 4.03
Restricted Stock Units (RSUs) \| Key Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)						246,755
Restricted Stock Units (RSUs) \| Plan 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)							14,661	9,171
Performance Awards Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)						100,833
Percentage of target to be achieved to be eligible to receive performance awards						100.00%
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost for unvested restricted stock						$ 100
Weighted average remaining life						4 months 24 days
Aggregate fair value						$ 100
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period						1 year
Minimum \| Plan 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Payout range as a percent of award target						0.00%
Minimum \| Performance Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period						1 year
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period						2 years
Maximum \| Plan 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Payout range as a percent of award target						200.00%
Maximum \| Performance Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period						2 years