LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 27, 2020	Jun. 27, 2020
Leases [Abstract]
Operating lease expense - occupancy expenses	$ 2,088	$ 7,005
Occupancy lease expense - general and administrative expenses	158	481
Variable lease expense	132	2,500
Total lease expense	$ 2,378	$ 9,986