Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)		1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 30, 2014	Nov. 30, 2015 restaurant	Mar. 29, 2017 USD ($) restaurant supplier segment	Mar. 30, 2016 USD ($)	Dec. 28, 2016 USD ($) supplier	May 05, 2017 USD ($) restaurant	Dec. 30, 2015 USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | segment			1
Restricted dividend payments, description			Under the 2014 Revolver, Holdings may not make certain payments such as cash dividends, except that it may, inter alia, (i) pay up to $1.0 million per year to repurchase or redeem qualified equity interests of Holdings held by past or present officers, directors, or employees (or their estates) of the Company upon death, disability, or termination of employment, (ii) pay under its income tax receivable agreement (the “TRA”), and, (iii) so long as no default or event of default has occurred and is continuing, (a) make non-cash repurchases of equity interests in connection with the exercise of stock options by directors and officers, provided that those equity interests represent a portion of the consideration of the exercise price of those stock options, (b) pay up to $2.5 million per year pursuant to stock option plans, employment agreements, or incentive plans, (c) make up to $5.0 million in other restricted payments per year, and (d) make other restricted payments, provided that such payments would not cause, in each case, on a pro forma basis, (x) its lease-adjusted consolidated leverage ratio to equal or exceed 4.25 times and (y) its consolidated fixed charge coverage ratio to be less than 1.75 times.
Total amount of outstanding debt			$ 101,400,000
Cash available			6,652,000	$ 8,864,000	$ 2,168,000		$ 6,101,000
Number of restaurants damaged | restaurant		1
Costs incurred directly related to fire (less than $0.1 million)			0	48,000
Gain on recovery of insurance proceeds, related to the reimbursement of property and equipment and expenses incurred			0	289,000
Amount received from insurance company in cash				400,000
Operating lease obligations					280,100,000
Deferred tax assets			6,482,000		25,905,000
Unrecognized tax benefits, accrual of interest or penalties			0		$ 0
Unrecognized tax benefits, interest or penalties expenses			0	$ 0
Percentage of cash savings in taxes realized as a result of utilizing net operating losses payable to pre-IPO stockholders	85.00%
Indefinite-lived Intangible Assets
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Asset impairment charges			$ 0
Supplier Concentration Risk
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of suppliers | supplier			0		1
Entity Operated Units
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant			204
Franchised Units
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant			263
Subsequent Event
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant						2
Subsequent Event | Senior Secured Revolving Credit Facility
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Pre-payment for new restaurant						$ 1,000,000
2014 Revolver | Senior Secured Revolving Credit Facility
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Restrictive covenants, maximum annual repurchase or redemption of qualified entity interests			$ 1,000,000
Restrictive covenants, maximum annual payment for stock option plans, employment agreements and incentive plans			2,500,000
Restrictive covenants, maximum annual payment for other restricted payments			$ 5,000,000
Maximum leverage ratio			4.25
Covenant description, coverage ratio			1.75
Amount of borrowings available			$ 90,900,000
Supplier Two | Accounts Payable | Supplier Concentration Risk
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of concentration					16.00%
Largest Supplier One | Purchased | Supplier Concentration Risk
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of concentration			29.00%	33.00%
Los Angeles | Revenue | Geographic Concentration Risk
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of concentration			73.00%	76.00%
Accounting Standards Update 2015-07 [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Deferred tax assets					$ 21,500,000
Amount reclassified out of deferred tax assets, current					$ 21,500,000