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Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 02, 2018 USD ($)	Jul. 01, 2018 USD ($)	Jul. 02, 2017 USD ($)	Jul. 01, 2018 USD ($) Segment Obligation	Jul. 02, 2017 USD ($)	Dec. 31, 2017 USD ($)
Accounting Policies [Line Items]
Reporting period, minimum				364 days
Reporting period, maximum				371 days
Increase to retained earnings, net of tax due to the cumulative effect related to the change in accounting for stored value card breakage				$ 575,000
Number of reportable segment | Segment				1
Number of performance obligation | Obligation				1
Percentage of gift card historical breakage rate				5.00%
Stored value card redemption revenue recognized		$ 1,700,000	$ 1,700,000	$ 3,900,000	$ 3,900,000
Outstanding stored value card liabilities		5,700,000		$ 5,700,000		$ 7,400,000
Stored value cards redeemed period				2 years
Long-lived assets to be held and used		500,000		$ 500,000
Impairment charges				0	0
Stored Value Card Breakage Revenue [Member]
Accounting Policies [Line Items]
Recognized stored value card breakage revenue		88,000	$ 111,000	206,000	$ 223,000
ASC 605 [Member] | Merchandise Member]
Accounting Policies [Line Items]
Estimated right of return net liability		900,000		900,000
Estimated right of returns net		$ 0		0
ASU No. 2014-09 [Member] | ASC 606 [Member]
Accounting Policies [Line Items]
Increase to retained earnings, net of tax due to the cumulative effect related to the change in accounting for stored value card breakage	$ 600,000
ASU No. 2014-09 [Member] | ASC 606 [Member] | Merchandise Member]
Accounting Policies [Line Items]
Estimated right of return related to estimated sales returns	$ 1,300,000			900,000
Allowance for sales returns reserve				$ 1,800,000
First Quarter [Member]
Accounting Policies [Line Items]
Interim reporting periods				91 days		91 days
Second Quarter [Member]
Accounting Policies [Line Items]
Interim reporting periods				91 days		91 days
Third Quarter [Member]
Accounting Policies [Line Items]
Interim reporting periods				91 days		91 days
Fourth Quarter [Member]
Accounting Policies [Line Items]
Interim reporting periods				91 days		91 days

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The maximum interim period for which financial information can be reported for the entity. Translates to a 13- or 14-week fiscal quarter, the latter of which can occur approximately every five years based upon the entity's calendar shift relative to the impact of a leap year on the entity's fiscal calendar and an extra day each year resulting from a 52-week fiscal year.

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Percentage of gift card historical breakage rate.

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Revenue recognition estimated right of returns net.

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Carrying value as of the balance sheet date of the liability for outstanding gift cards. Retail customers purchase gift cards or gift certificates that can be redeemed at a later date for merchandise or services; those unredeemed represent a liability of the entity because the revenue is being deferred.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of the cumulative effect on retained earnings net of related income tax effect.

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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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