Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Oct. 01, 2017	Apr. 02, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016	Jan. 01, 2017
Accounting Policies [Line Items]
Reporting period, minimum				364 days
Reporting period, maximum				371 days
Unrecognized tax benefits		$ 0
Cumulative effect adjustment to retained earnings		$ 0
Estimated gift card redemption period				20 quarters
Outstanding gift card liabilities	$ 4,100,000			$ 4,100,000		$ 5,300,000
Long-lived assets to be held and used	500,000			500,000
Impairment charges				0	$ 0
Gift Card Breakage Revenue [Member]
Accounting Policies [Line Items]
Recognized gift card breakage revenue	$ 111,000		$ 112,000	$ 334,000	$ 337,000
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