LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 28, 2020	Mar. 28, 2020
Leases [Abstract]
Operating lease expense - occupancy expenses	$ 2,393	$ 4,917
Occupancy lease expense - general and administrative expenses	166	323
Variable lease expense	612	2,368
Total lease expense	$ 3,171	$ 7,608