SEGMENT REPORTING (Details) $ in Millions	3 Months Ended	9 Months Ended
Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| segment			2
Number of reporting segments \| segment			2
Net sales	$ 6,619.0	$ 6,720.0	$ 19,190.0	$ 17,858.0
Total segment income	243.0	233.0	848.0	454.0
Intangible amortization	15.0	16.0	45.0	47.0
Stock-based compensation	25.0	25.0	69.0	62.0
Operating income	251.0	240.0	745.0	512.0
Anord Mardix
Segment Reporting Information [Line Items]
Acquisition related costs	4.8
Flex Agility Solutions
Segment Reporting Information [Line Items]
Net sales	3,581.0	3,834.0	10,450.0	10,063.0
Flex Reliability Solutions
Segment Reporting Information [Line Items]
Net sales	3,038.0	2,886.0	8,740.0	7,795.0
Operating Segments
Segment Reporting Information [Line Items]
Net sales	6,619.0	6,720.0	19,190.0	17,858.0
Total segment income	298.0	311.0	874.0	721.0
Operating Segments \| Flex Agility Solutions
Segment Reporting Information [Line Items]
Net sales	3,581.0	3,834.0	10,450.0	10,063.0
Total segment income	163.0	153.0	453.0	313.0
Operating Segments \| Flex Reliability Solutions
Segment Reporting Information [Line Items]
Net sales	3,038.0	2,886.0	8,740.0	7,795.0
Total segment income	154.0	178.0	475.0	472.0
Operating Segments \| Corporate and Other
Segment Reporting Information [Line Items]
Total segment income	(19.0)	(20.0)	(54.0)	(64.0)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Intangible amortization	15.0	16.0	45.0	47.0
Stock-based compensation	25.0	25.0	69.0	62.0
Restructuring charges	2.0	30.0	10.0	75.0
Legal and other	$ 5.0	$ 0.0	$ 5.0	$ 25.0

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