Income Taxes - Additional Information (Details) - USD ($)		12 Months Ended
	Jul. 30, 2014	Dec. 26, 2018	Dec. 27, 2017	Dec. 28, 2016
Investments, Owned, Federal Income Tax Note [Line Items]
Change in tax rate, decrease in deferred tax asset			$ 12,100,000
Change in tax rate, decrease in deferred tax liability			13,500,000
Net benefit to deferred income tax expense		$ 0	1,440,000	$ 0
Valuation allowance		5,149,000	4,306,000	3,300,000
Increase in valuation allowance		800,000	1,000,000
Percentage of cash savings in taxes realized as a result of utilizing net operating losses payable to pre-IPO stockholders	85.00%
TRA tax expense (benefit)		(800,000)	5,600,000	400,000
Payments to pre-IPO stockholders under TRA		7,272,000	11,109,000	3,236,000
Deferred tax asset credit		13,001,000	12,722,000
Alternative minimum tax credits		500,000
Unrecognized tax benefits		0	0	0
Unrecognized tax benefits interest accrued		0	0	0
Unrecognized tax benefits penalties accrued		0	0	$ 0
Federal
Investments, Owned, Federal Income Tax Note [Line Items]
Net operating loss carryforwards		29,800,000
State and Local Jurisdiction
Investments, Owned, Federal Income Tax Note [Line Items]
Net operating loss carryforwards		100,000
Enterprise Zone | State and Local Jurisdiction
Investments, Owned, Federal Income Tax Note [Line Items]
Tax credits carry forward		10,900,000
WOTC | Federal
Investments, Owned, Federal Income Tax Note [Line Items]
Tax credits carry forward		1,400,000
California | Enterprise Zone
Investments, Owned, Federal Income Tax Note [Line Items]
Deferred tax asset credit		$ 4,400,000	$ 5,400,000