SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended
Jun. 26, 2020	Jun. 28, 2019
Segment Reporting Information [Line Items]
Net sales	$ 5,153,333	$ 6,175,939
Income before income taxes	67,383	64,109
Intangible amortization	15,176	17,082
Stock-based compensation	12,769	15,227
Restructuring charges	9,682	56,200
Interest and other, net	30,257	53,157
Flex Agility Solutions
Segment Reporting Information [Line Items]
Net sales	2,912,030	3,908,176
Flex Reliability Solutions
Segment Reporting Information [Line Items]
Net sales	2,241,303	2,267,763
Operating Segments
Segment Reporting Information [Line Items]
Net sales	5,153,333	6,175,939
Income before income taxes	162,872	207,860
Operating Segments \| Flex Agility Solutions
Segment Reporting Information [Line Items]
Net sales	2,912,030	3,908,176
Income before income taxes	71,807	108,958
Operating Segments \| Flex Reliability Solutions
Segment Reporting Information [Line Items]
Net sales	2,241,303	2,267,763
Income before income taxes	114,737	129,994
Operating Segments \| Corporate and Other
Segment Reporting Information [Line Items]
Income before income taxes	(23,672)	(31,092)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Intangible amortization	15,176	17,082
Stock-based compensation	12,769	15,227
Customer related asset impairments	(76)	483
Restructuring charges	9,682	56,192
Legal and other	27,681	1,610
Interest and other, net	$ 30,257	$ 53,157

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