Stock-Based Compensation - Summary of Stock Option Activity (Detail) - $ / shares shares in Thousands	3 Months Ended	12 Months Ended
Mar. 28, 2021	Dec. 27, 2020	Mar. 28, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding shares, beginning balance	1,233
Options, canceled	(307)
Options outstanding shares, ending balance	926	1,233
Options outstanding shares, exercisable			922
Options outstanding weighted average exercise price, beginning balance	$ 10.68
Options, weighted average exercise price, canceled	12.61
Options outstanding weighted average exercise price, ending balance	$ 10.68	$ 10.68	$ 10.04
Options outstanding weighted average exercise price, exercisable			$ 10.03
Option outstanding weighted average remaining term	1 year 9 months 21 days	2 years 5 months 26 days
Options exercisable weighted average remaining term	1 year 9 months 14 days

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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.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
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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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- Definition

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.

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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 grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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