Income Tax - Summary of Deferred Tax Assets and Liabilities (Parenthetical) (Detail) - State [Member] $ in Millions	12 Months Ended
Dec. 29, 2018 USD ($)
Income Tax Expense Benefit Continuing Operations [Line Items]
Net operating losses	$ 3.4
Net operating losses, expiration date, description	which expire in tax years 2021 through 2038 if not utilized

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant