SEGMENT REPORTING (Details) $ in Millions	3 Months Ended	6 Months Ended
Oct. 01, 2021 USD ($)	Sep. 25, 2020 USD ($)	Oct. 01, 2021 USD ($) segment	Sep. 25, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| segment			2
Number of reporting segments \| segment			2
Net sales	$ 6,229.0	$ 5,985.0	$ 12,571.0	$ 11,138.0
Total segment income	371.0	153.0	604.0	221.0
Intangible amortization	15.0	16.0	30.0	31.0
Stock-based compensation	24.0	24.0	44.0	37.0
Restructuring charges	0.0	11.0	0.0	11.0
Operating income	237.0	175.0	493.0	272.0
Flex Agility Solutions
Segment Reporting Information [Line Items]
Net sales	3,437.0	3,318.0	6,869.0	6,230.0
Flex Reliability Solutions
Segment Reporting Information [Line Items]
Net sales	2,792.0	2,667.0	5,702.0	4,908.0
Operating Segments
Segment Reporting Information [Line Items]
Net sales	6,229.0	5,985.0	12,571.0	11,138.0
Total segment income	286.0	247.0	576.0	410.0
Operating Segments \| Flex Agility Solutions
Segment Reporting Information [Line Items]
Net sales	3,437.0	3,318.0	6,869.0	6,230.0
Total segment income	153.0	88.0	290.0	160.0
Operating Segments \| Flex Reliability Solutions
Segment Reporting Information [Line Items]
Net sales	2,792.0	2,667.0	5,702.0	4,908.0
Total segment income	151.0	179.0	321.0	294.0
Operating Segments \| Corporate and Other
Segment Reporting Information [Line Items]
Total segment income	(18.0)	(20.0)	(35.0)	(44.0)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Intangible amortization	15.0	16.0	30.0	31.0
Stock-based compensation	24.0	24.0	44.0	37.0
Restructuring charges	9.0	35.0	9.0	45.0
Legal and other	$ 1.0	$ (3.0)	$ 0.0	$ 25.0

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