CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Ordinary Shares	Ordinary Shares Cumulative Effect, Period of Adoption, Adjustment	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Unrealized Gain (Loss) on Derivative Instruments and Other	Foreign Currency Translation Adjustments	Total Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Mar. 31, 2019			517,000,000
Beginning balance at Mar. 31, 2019	$ 2,972,000	$ 21,000	$ 6,136,000	$ (1,000)	$ (3,012,000)	$ 22,000	$ (42,000)	$ (110,000)	$ (152,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Flex Ltd. ordinary shares at cost (in shares)			(16,000,000)
Repurchase of Flex Ltd. ordinary shares at cost	(173,000)		$ (173,000)
Exercise of stock options	1,000		$ 1,000
Issuance of Flex Ltd. vested shares under restricted share unit awards (in shares)			3,000,000
Net income	39,000				39,000
Stock-based compensation	53,000		$ 53,000
Total other comprehensive income (loss)	(14,000)						(3,000)	(11,000)	(14,000)
Ending balance (in shares) at Dec. 31, 2019			504,000,000
Ending balance at Dec. 31, 2019	2,899,000		$ 6,016,000		(2,951,000)		(45,000)	(121,000)	(166,000)
Beginning balance (in shares) at Sep. 27, 2019			509,000,000
Beginning balance at Sep. 27, 2019	2,806,000		$ 6,058,000		(3,062,000)		(59,000)	(131,000)	(190,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Flex Ltd. ordinary shares at cost (in shares)			(5,000,000)
Repurchase of Flex Ltd. ordinary shares at cost	(61,000)		$ (61,000)
Net income	111,000				111,000
Stock-based compensation	19,000		$ 19,000
Total other comprehensive income (loss)	24,000						14,000	10,000	24,000
Ending balance (in shares) at Dec. 31, 2019			504,000,000
Ending balance at Dec. 31, 2019	$ 2,899,000		$ 6,016,000		(2,951,000)		(45,000)	(121,000)	(166,000)
Beginning balance (in shares) at Mar. 31, 2020	497,426,277		497,000,000
Beginning balance at Mar. 31, 2020	$ 2,831,000		$ 5,948,000		(2,902,000)		(82,000)	(133,000)	(215,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Flex Ltd. ordinary shares at cost (in shares)			(2,000,000)
Repurchase of Flex Ltd. ordinary shares at cost	(38,000)		$ (38,000)
Issuance of Flex Ltd. vested shares under restricted share unit awards (in shares)			4,000,000
Net income	373,000				373,000
Stock-based compensation	62,000		$ 62,000
Total other comprehensive income (loss)	$ 153,000						66,000	87,000	153,000
Ending balance (in shares) at Dec. 31, 2020	498,971,803		499,000,000
Ending balance at Dec. 31, 2020	$ 3,381,000		$ 5,972,000		(2,529,000)		(16,000)	(46,000)	(62,000)
Beginning balance (in shares) at Sep. 25, 2020			501,000,000
Beginning balance at Sep. 25, 2020	3,115,000		$ 5,985,000		(2,737,000)		(45,000)	(88,000)	(133,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Flex Ltd. ordinary shares at cost (in shares)			(2,000,000)
Repurchase of Flex Ltd. ordinary shares at cost	(38,000)		$ (38,000)
Net income	208,000				208,000
Stock-based compensation	25,000		$ 25,000
Total other comprehensive income (loss)	$ 71,000						29,000	42,000	71,000
Ending balance (in shares) at Dec. 31, 2020	498,971,803		499,000,000
Ending balance at Dec. 31, 2020	$ 3,381,000		$ 5,972,000		$ (2,529,000)		$ (16,000)	$ (46,000)	$ (62,000)