LEASES (Details) - item	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 30, 2018
Lessee, Lease, Description [Line Items]
Number of asset classes	3
Number of leases with contingent provisions, concessions, or restrictive covenants	0
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Lessee, Operating Lease, Existence of Option to Terminate [true false]	true
Number of parking lot leases	1
Tenure for certain lease contracts		8 years
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	9 years
Parking Lot
Lessee, Lease, Description [Line Items]
Remaining lease term	43 years