INCOME TAXES - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 24, 2020	Jun. 26, 2019	Jun. 24, 2020	Jun. 26, 2019	Dec. 25, 2019
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation (in percentage)	25.30%	8.60%	23.90%	17.30%
Ownership percentage, weighted average	92.30%	81.00%	92.00%	80.30%
Deferred tax asset recognized as a result of investment in partnership			$ 1,297,000
Deferred tax asset related to additional tax basis			88,000
Uncertain tax positions	$ 0		$ 0
Percentage of tax benefits due to equity owners	85.00%		85.00%
Percentage of tax benefits expected to be realized	15.00%		15.00%
Consolidated Entity, Ownership By Parent, LLC Units Acquired			28,195
Establishment of liabilities under tax receivable agreement		$ 1,636,000	$ 313,000	$ 14,395,000
Tax receivable agreement payments to related parties	$ 74,000	$ 0	6,643,000	$ 707,000
Liabilities under tax receivable agreement	228,096,000		228,096,000		$ 234,426,000
Current portion of liabilities under tax receivable agreement	0		0		$ 7,777,000
Deduction recognized	171,000
Foreign Tax Credit
Income Tax Contingency [Line Items]
Deferred tax assets, valuation allowance	749,000		749,000
Current Liabilities
Income Tax Contingency [Line Items]
Current portion of liabilities under tax receivable agreement	0		$ 0
Limited Liability Company
Income Tax Contingency [Line Items]
Units acquired during the period (in shares)			169,699
Deferred tax asset, investment in partnership	172,350,000		$ 172,350,000
Deferred tax assets, valuation allowance	$ 104,000		$ 104,000