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Stockholders' Equity and Stock-Based Compensation - Summary of Activity of Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 30, 2017
Activity of stock option plans [Roll Forward]
Number of Shares Outstanding (Options), Beginning Balance (in shares)	216,326
Number of Shares Outstanding (Options), Exercised (in shares)	(72,602)
Number of Shares Outstanding (Options), Ending Balance (in shares)	143,724	216,326
Number of Shares Outstanding (Options), Exercisable (in shares)	143,724
Weighted average exercise price for stock option plans [Roll Forward]
Weighted Average Exercise Price, Beginning Balance (in dollars per share)	$ 16.82
Weighted Average Exercise Price, Exercised (in dollars per share)	16.57
Weighted Average Exercise Price, Ending Balance (in dollars per share)	16.94	$ 16.82
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 16.94
Weighted Average Remaining Contractual Term, Outstanding	1 year 3 months 10 days	1 year 9 months 3 days
Weighted Average Remaining Contractual Term, Exercisable	1 year 3 months 10 days
Aggregate Intrinsic Value, Outstanding	$ 2,654	$ 4,405
Aggregate Intrinsic Value, Exercisable	$ 2,654

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- Definition

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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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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

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