SUBSEQUENT EVENT (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 30, 2020 item	Jun. 28, 2020 USD ($)	Mar. 29, 2020 USD ($) item	Jun. 28, 2020 USD ($)	Sep. 27, 2020 USD ($)
Subsequent Events
Number of rejected leases | item			5
Provision for estimated damages on rejected leases			$ 765
Rejected leases - ROU assets			24,000
Rejected leases - Lease liability			31,800
Rejected leases - PP&E			31,000
Rejected leases - financing obligations			$ 41,900
Subsequent event
Subsequent Events
Number of rejected leases | item	5
Estimated damages on rejected financing leases		$ 3,300		$ 3,300
Gain (loss) on reduction of PP&E and financing obligations		11,000		11,000
Subsequent event | Minimum
Subsequent Events
Estimated damages on rejected operating leases		9,000		9,000	$ 9,000
Subsequent event | Maximum
Subsequent Events
Estimated damages on rejected operating leases		$ 11,000		$ 11,000	$ 11,000