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SUMMARY OF ACCOUNTING POLICIES - Customer Working Capital Advances and Other Current Assets/Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Mar. 31, 2024
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Accounting Policies [Abstract] |  |
Customer working capital advances | $ 1,600 | $ 2,200
Deferred tax asset | 577 | 644
Other liabilities, customer-related accruals, current | $ 246 | $ 277

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- Definition Customer Working Capital Advances + References No definition available. + Details
Name: | flex_CustomerWorkingCapitalAdvances
Namespace Prefix: | flex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Liabilities, Customer-Related Accruals, Current + References No definition available. + Details
Name: | flex_OtherLiabilitiesCustomerRelatedAccrualsCurrent
Namespace Prefix: | flex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and other assets expected to be realized or consumed after one year or normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant