SEGMENT REPORTING AND GEOGRAPHIC INFORMATION SEGMENT REPORTING AND GEOGRAPHIC INFORMATION - Segment Revenue and Gross Margin Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 28, 2020	Mar. 28, 2020	Mar. 30, 2019	Mar. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Depreciation, as reviewed by CODM									$ 15,200		$ 11,000	$ 7,600
Net revenues	$ 403,043	$ 384,471	$ 461,709	$ 447,767	$ 468,488	$ 501,669	$ 483,069	$ 221,309	1,696,990	$ 1,696,990	1,674,535	856,903
Gross profit	$ (10,328)	$ 143,846	$ 206,071	$ 212,646	$ 216,530	$ 215,137	$ 152,629	$ 109,843	552,235		694,139	439,115
Consumer optimization									(24,115)		(7,386)	(3,456)
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total segment revenues as reviewed by CODM									1,730,943		1,759,359	856,903
Gross profit									898,594		928,952	444,322
Segment Reconciling Items
Segment Reporting, Asset Reconciling Item [Line Items]
Deferred revenue purchase accounting									(33,953)		(84,824)	0
Asset impairment									(174,235)		0	0
Purchase accounting amortization									(122,553)		(114,361)	0
Inventory valuation adjustment									0		(30,395)	0
Consumer optimization									(10,415)		0	0
Integration and rebranding costs									(1,211)		(1,057)	0
Stock-based compensation									(3,992)		(4,176)	(3,622)
Other adjustments									$ 0		$ 0	$ (1,585)