SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 29, 2021	Dec. 30, 2020	Dec. 25, 2019
Property, Plant and Equipment [Line Items]
Impairment charges	$ 0	$ 7,644,000	$ 0
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	5 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	7 years
Furniture and Fixtures | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	5 years
Furniture and Fixtures | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	7 years
Computer Equipment and Software | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	2 years
Computer Equipment and Software | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	5 years