Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)		1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Jul. 30, 2014	Nov. 30, 2015 restaurant	Sep. 27, 2017 USD ($)	Jun. 28, 2017 USD ($) restaurant	Jun. 29, 2016 USD ($)	Jun. 28, 2017 USD ($) restaurant supplier segment	Jun. 29, 2016 USD ($)	Dec. 28, 2016 USD ($) supplier	Jul. 31, 2017 restaurant	Jul. 18, 2017 USD ($)	Jul. 17, 2017	Dec. 30, 2015 USD ($)
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				$ 94,900,000		$ 94,900,000
Cash available				4,371,000	$ 9,496,000	4,371,000	$ 9,496,000	$ 2,168,000				$ 6,101,000
Number of restaurants damaged | restaurant		1
Expenses incurred from fire damage						100,000
Property, Plant and Equipment, Disposals												$ 100,000
Property and equipment owned, net				126,631,000		126,631,000		118,470,000
Impairment of property and equipment				386,000		445,000	56,000
Costs incurred directly related to fire (less than $0.1 million)				0	0	0	48,000
Gain on recovery of insurance proceeds, related to the reimbursement of property and equipment and expenses incurred				0		0	889,000
Amount received from insurance company in cash							1,000,000
Operating lease obligations								307,200,000
Deferred tax assets				6,360,000		6,360,000		25,905,000
Unrecognized tax benefits, accrual of interest or penalties				0		0		$ 0
Unrecognized tax benefits, interest or penalties expenses				0	0	0	0
Percentage of cash savings in taxes realized as a result of utilizing net operating losses payable to pre-IPO stockholders	85.00%
Recovery of securities class action legal expense				(511,000)	$ 0	$ (511,000)	$ 0
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				208		208
Franchised Units
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant				264		264
Subsequent Event
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Recovery of Securities Class Action Legal Costs			$ 600,000
Asset impairment charges			$ 3,400,000
Subsequent Event | Senior Secured Revolving Credit Facility
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Pre-payment for new restaurant										$ 4,000,000
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				$ 97,400,000		$ 97,400,000
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				33.00%	34.00%	32.00%	34.00%
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
Trimaran Pollo Partners L L C [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Noncontrolling Interest, Description						So long as LLC maintains at least 40% ownership, (i) any member of the board of directors may be removed at any time without cause by affirmative vote of a majority of the Company’s common stock, and (ii) stockholders representing 40% or greater ownership may cause special stockholder meetings to be called.
Fair Value, Measurements, Nonrecurring [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment owned, net				$ 302,000		$ 302,000
Impairment of property and equipment				387,000		387,000
Parent Company [Member] | Subsequent Event
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant									1
Franchisees [Member] | Subsequent Event
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants											1
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment owned, net				$ 302,000		$ 302,000
Los Angeles [Member] | Revenue | Geographic Concentration Risk
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of concentration				73.00%	75.00%	73.00%	75.00%