CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Ordinary Shares	Accumulated Deficit	Unrealized Gain (Loss) on Derivative Instruments and Other	Foreign Currency Translation Adjustments	Total Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Mar. 31, 2018		528,078,000
Beginning balance at Mar. 31, 2018	$ 3,018,573	$ 6,248,532	$ (3,144,114)	$ (35,746)	$ (50,099)	$ (85,845)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Flex Ltd. ordinary shares at cost (in shares)		(11,151,000)
Repurchase of Flex Ltd. ordinary shares at cost	(123,978)	$ (123,978)
Exercise of stock options (in shares)		170,000
Exercise of stock options	194	$ 194
Issuance of Flex Ltd. vested shares under restricted share unit awards (in shares)		5,376,000
Net income (loss)	157,751		157,751
Stock-based compensation, net of tax	61,060	$ 61,060
Cumulative effect on opening equity of adopting accounting standards and other	38,406	$ (296)	38,702
Total other comprehensive income (loss)	(73,678)			(15,193)	(58,485)	(73,678)
Ending balance (in shares) at Dec. 31, 2018		522,473,000
Ending balance at Dec. 31, 2018	3,078,328	$ 6,185,512	(2,947,661)	(50,939)	(108,584)	(159,523)
Beginning balance (in shares) at Sep. 28, 2018		528,887,000
Beginning balance at Sep. 28, 2018	3,169,547	$ 6,228,420	(2,902,492)	(55,574)	(100,807)	(156,381)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Flex Ltd. ordinary shares at cost (in shares)		(6,722,000)
Repurchase of Flex Ltd. ordinary shares at cost	(63,998)	$ (63,998)
Exercise of stock options (in shares)		94,000
Exercise of stock options	63	$ 63
Issuance of Flex Ltd. vested shares under restricted share unit awards (in shares)		214,000
Net income (loss)	(45,169)		(45,169)
Stock-based compensation, net of tax	21,027	$ 21,027
Total other comprehensive income (loss)	(3,142)			4,635	(7,777)	(3,142)
Ending balance (in shares) at Dec. 31, 2018		522,473,000
Ending balance at Dec. 31, 2018	$ 3,078,328	$ 6,185,512	(2,947,661)	(50,939)	(108,584)	(159,523)
Beginning balance (in shares) at Mar. 31, 2019	516,548,265	516,548,000
Beginning balance at Mar. 31, 2019	$ 2,972,360	$ 6,135,535	(3,012,012)	(41,556)	(109,607)	(151,163)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Flex Ltd. ordinary shares at cost (in shares)		(16,238,000)
Repurchase of Flex Ltd. ordinary shares at cost	(173,117)	$ (173,117)
Exercise of stock options (in shares)		225,000
Exercise of stock options	1,196	$ 1,196
Issuance of Flex Ltd. vested shares under restricted share unit awards (in shares)		3,707,000
Net income (loss)	39,320		39,320
Stock-based compensation, net of tax	53,332	$ 53,332
Cumulative effect on opening equity of adopting accounting standards and other	21,583	$ (440)	22,023
Total other comprehensive income (loss)	$ (15,362)			(3,856)	(11,506)	(15,362)
Ending balance (in shares) at Dec. 31, 2019	504,242,496	504,242,000
Ending balance at Dec. 31, 2019	$ 2,899,312	$ 6,016,506	(2,950,669)	(45,412)	(121,113)	(166,525)
Beginning balance (in shares) at Sep. 27, 2019		509,150,000
Beginning balance at Sep. 27, 2019	2,805,961	$ 6,057,782	(3,062,057)	(58,654)	(131,110)	(189,764)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Flex Ltd. ordinary shares at cost (in shares)		(5,285,000)
Repurchase of Flex Ltd. ordinary shares at cost	(60,959)	$ (60,959)
Exercise of stock options (in shares)		47,000
Exercise of stock options	468	$ 468
Issuance of Flex Ltd. vested shares under restricted share unit awards (in shares)		330,000
Net income (loss)	111,388		111,388
Stock-based compensation, net of tax	19,215	$ 19,215
Total other comprehensive income (loss)	$ 23,239			13,242	9,997	23,239
Ending balance (in shares) at Dec. 31, 2019	504,242,496	504,242,000
Ending balance at Dec. 31, 2019	$ 2,899,312	$ 6,016,506	$ (2,950,669)	$ (45,412)	$ (121,113)	$ (166,525)