SEGMENT REPORTING (Details) $ in Millions	3 Months Ended	9 Months Ended
Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| segment			3
Number of reporting segments \| segment			3
Net sales	$ 7,756.0	$ 6,619.0	$ 22,869.0	$ 19,190.0
Operating income	321.0	251.0	918.0	745.0
Intangible amortization	19.0	15.0	62.0	45.0
Stock-based compensation	27.0	25.0	80.0	69.0
Interest and other, net	59.0	8.0	152.0	(103.0)
Income before income taxes	262.0	243.0	766.0	848.0
Anord Mardix
Segment Reporting Information [Line Items]
Acquisition related costs	5.0
Operating Segments
Segment Reporting Information [Line Items]
Net sales	7,756.0	6,619.0	22,869.0	19,190.0
Operating Segments \| Flex Agility Solutions
Segment Reporting Information [Line Items]
Net sales	4,029.0	3,581.0	12,024.0	10,450.0
Operating income	181.0	163.0	523.0	453.0
Operating Segments \| Flex Reliability Solutions
Segment Reporting Information [Line Items]
Net sales	3,225.0	2,711.0	9,493.0	7,758.0
Operating income	143.0	136.0	465.0	407.0
Operating Segments \| Nextracker
Segment Reporting Information [Line Items]
Net sales	516.0	338.0	1,384.0	1,018.0
Operating income	60.0	18.0	133.0	68.0
Intersegment eliminations
Segment Reporting Information [Line Items]
Net sales	(14.0)	(11.0)	(32.0)	(36.0)
Corporate and Other
Segment Reporting Information [Line Items]
Operating income	(12.0)	(19.0)	(43.0)	(54.0)
Total segment income
Segment Reporting Information [Line Items]
Operating income	372.0	298.0	1,078.0	874.0
Segment Reconciling Items
Segment Reporting Information [Line Items]
Intangible amortization	19.0	15.0	62.0	45.0
Stock-based compensation	27.0	25.0	80.0	69.0
Restructuring charges	5.0	2.0	5.0	10.0
Legal and other	0.0	5.0	13.0	5.0
Interest and other, net	$ 59.0	$ 8.0	$ 152.0	$ (103.0)

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