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Share based compensation arrangement by share-based payment award, percentage of shares Issuable based on target performance.

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Share based compensation arrangement by share based payment award percentage of shares issued based on target performance.

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

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Share based compensation arrangement by share based payment award performance percentage achieved.

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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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of noncash expense for share-based payment arrangement.

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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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Description of terms of award under share-based payment arrangement.

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

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

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Stock Based-Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands				3 Months Ended		9 Months Ended
	May 22, 2019 Member $ / shares shares	Mar. 01, 2019 shares	Feb. 14, 2019 $ / shares shares	Sep. 28, 2019 USD ($) $ / shares shares	Sep. 29, 2018 USD ($)	Sep. 28, 2019 USD ($) $ / shares shares	Sep. 29, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options exercised				210,931		532,931
Weighted average exercise price of options exercised \| $ / shares				$ 2.00		$ 2.37
Compensation expense for stock based awards \| $				$ 1,000	$ 1,300	$ 3,246	$ 2,543
Executives and Non-Executive Employees [Member] \| Fixed Criteria [Member] \| 2019 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards			129,314
Options vesting period			3 years
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation \| $				$ 6,100		$ 6,100
Weighted-average period						1 year 10 months 24 days
Restricted Stock Award [Member] \| Executives and Non-Executive Employees [Member] \| 2019 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards			258,628
Fair value of common stock \| $ / shares			$ 17.76
Restricted Stock Award [Member] \| Executives and Non-Executive Employees [Member] \| 2018 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards		33,663
Target performance percentage achieved		120.00%
Percentage of shares issued based on target performance		150.00%
Restricted Stock Award [Member] \| Non-management Members of Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards	37,000
Fair value of common stock \| $ / shares	$ 15.35
Number of non management members \| Member	8
Company Performance Criteria [Member] \| Executives and Non-Executive Employees [Member] \| 2019 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards			129,314
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance criteria defined in share awards						The performance percentages, ranging from less than 80% to greater than 120%, provide for the awarding of shares ranging from no shares to 150% of the target number of shares.
Restricted Stock [Member] \| Executives and Non-Executive Employees [Member] \| 2019 Long-Term Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance percentage			80.00%
Percentage of shares issuable based on target performance			0.00%
Restricted Stock [Member] \| Executives and Non-Executive Employees [Member] \| 2019 Long-Term Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance percentage			120.00%
Percentage of shares issuable based on target performance			150.00%