SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Segment Reporting Information [Line Items]
Net sales	$ 5,985,000	$ 6,088,000	$ 11,138,000	$ 12,264,000
Income before income taxes	153,000	(96,000)	221,000	(32,000)
Intangible amortization	16,000	16,000	31,000	33,000
Stock-based compensation	24,000	19,000	37,000	34,000
Restructuring charges	35,400	128,300	45,100	184,500
Interest and other, net	22,000	50,000	51,000	103,000
Flex Agility Solutions
Segment Reporting Information [Line Items]
Net sales	3,318,000	3,583,000	6,230,000	7,491,000
Flex Reliability Solutions
Segment Reporting Information [Line Items]
Net sales	2,667,000	2,505,000	4,908,000	4,773,000
Operating Segments
Segment Reporting Information [Line Items]
Net sales	5,985,000	6,088,000	11,138,000	12,264,000
Income before income taxes	247,000	227,000	410,000	435,000
Operating Segments | Flex Agility Solutions
Segment Reporting Information [Line Items]
Net sales	3,318,000	3,583,000	6,230,000	7,491,000
Income before income taxes	88,000	94,000	160,000	203,000
Operating Segments | Flex Reliability Solutions
Segment Reporting Information [Line Items]
Net sales	2,667,000	2,505,000	4,908,000	4,773,000
Income before income taxes	179,000	159,000	294,000	289,000
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Income before income taxes	(20,000)	(26,000)	(44,000)	(57,000)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Intangible amortization	16,000	16,000	31,000	33,000
Stock-based compensation	24,000	19,000	37,000	34,000
Customer related asset impairments (recoveries)	(3,000)	91,000	(3,000)	91,000
Restructuring charges	35,000	128,000	45,000	185,000
Legal and other	0	19,000	28,000	21,000
Interest and other, net	$ 22,000	$ 50,000	$ 51,000	$ 103,000