SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases (Details)	12 Months Ended
	Dec. 26, 2018 renewal_option lease	Dec. 27, 2017 lease
Operating Leased Assets [Line Items]
Number of renewal options | renewal_option	2
Period of renewal term	5 years
Number of sale leaseback transactions, accounting owner	24	23
Number of sale leaseback transactions	1	11
Minimum
Operating Leased Assets [Line Items]
Terms of lease contract	10 years
Maximum
Operating Leased Assets [Line Items]
Terms of lease contract	15 years