Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3367-108585

+ Details

Name:	us-gaap_PaymentsForRestructuring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(1))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

Name:	us-gaap_RestructuringReserveCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph 210-10-S99-1(SX 210.5-02(24))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

Name:	us-gaap_RestructuringReserveNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringReserveRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of decrease in the reserve for full or partial settlement through consideration other than cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

Name:	us-gaap_RestructuringReserveSettledWithoutCash2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	flex_RestructuringPaymentTypeAxis=flex_CashChargesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=flex_FiscalYear2019AndPriorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=flex_FiscalYear2020AndPriorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=flex_FiscalYear2021AndPriorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	flex_RestructuringPaymentTypeAxis=flex_NonCashChargesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=flex_LongLivedAssetImpairmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

RESTRUCTURING CHARGES - Provisions, Respective Payments and Remaining Accrued Balance (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Summarizes the provisions, respective payments, and remaining accrued balance
Balance at the beginning of the period	$ 53.0	$ 23.0	$ 32.0
Provision for charges incurred	15.0	101.0	216.4
Balance at the end of the period	43.0	53.0	23.0
Less: Current portion (classified as other current liabilities)	42.0
Accrued restructuring costs, net of current portion (classified as other liabilities)	1.0
Cash Charges
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred	(6.0)	(50.0)	(147.0)
Cash Charges \| Fiscal Year 2019 And Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred			(18.0)
Cash Charges \| Fiscal Year 2020 and Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred		(14.0)
Cash Charges \| Fiscal Year 2021 and Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred	(15.0)
Non-Cash Charges
Summarizes the provisions, respective payments, and remaining accrued balance
Provision for charges incurred			57.1
Non-cash charges incurred	(4.0)	(7.0)	(60.0)
Severance
Summarizes the provisions, respective payments, and remaining accrued balance
Balance at the beginning of the period	45.0	19.0	23.0
Provision for charges incurred	11.0	89.0	123.0
Balance at the end of the period	35.0	45.0	19.0
Less: Current portion (classified as other current liabilities)	34.0
Accrued restructuring costs, net of current portion (classified as other liabilities)	1.0
Severance \| Cash Charges
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred	(6.0)	(49.0)	(112.0)
Severance \| Cash Charges \| Fiscal Year 2019 And Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred			(15.0)
Severance \| Cash Charges \| Fiscal Year 2020 and Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred		(14.0)
Severance \| Cash Charges \| Fiscal Year 2021 and Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred	(15.0)
Severance \| Non-Cash Charges
Summarizes the provisions, respective payments, and remaining accrued balance
Non-cash charges incurred	0.0	0.0	0.0
Long-Lived Asset Impairment
Summarizes the provisions, respective payments, and remaining accrued balance
Balance at the beginning of the period	0.0	0.0	0.0
Provision for charges incurred	1.0	8.0	46.0
Balance at the end of the period	0.0	0.0	0.0
Less: Current portion (classified as other current liabilities)	0.0
Accrued restructuring costs, net of current portion (classified as other liabilities)	0.0
Long-Lived Asset Impairment \| Cash Charges
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred	0.0	0.0	0.0
Long-Lived Asset Impairment \| Cash Charges \| Fiscal Year 2019 And Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred			0.0
Long-Lived Asset Impairment \| Cash Charges \| Fiscal Year 2020 and Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred		0.0
Long-Lived Asset Impairment \| Cash Charges \| Fiscal Year 2021 and Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred	0.0
Long-Lived Asset Impairment \| Non-Cash Charges
Summarizes the provisions, respective payments, and remaining accrued balance
Non-cash charges incurred	(1.0)	(8.0)	(46.0)
Other Exit Costs
Summarizes the provisions, respective payments, and remaining accrued balance
Balance at the beginning of the period	8.0	4.0	9.0
Provision for charges incurred	3.0	4.0	47.0
Balance at the end of the period	8.0	8.0	4.0
Less: Current portion (classified as other current liabilities)	8.0
Accrued restructuring costs, net of current portion (classified as other liabilities)	0.0
Other Exit Costs \| Cash Charges
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred	0.0	(1.0)	(35.0)
Other Exit Costs \| Cash Charges \| Fiscal Year 2019 And Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred			(3.0)
Other Exit Costs \| Cash Charges \| Fiscal Year 2020 and Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred		0.0
Other Exit Costs \| Cash Charges \| Fiscal Year 2021 and Prior
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred	0.0
Other Exit Costs \| Non-Cash Charges
Summarizes the provisions, respective payments, and remaining accrued balance
Non-cash charges incurred	$ (3.0)	$ 1.0	$ (14.0)