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DESCRIPTION OF BUSINESS SEGMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES- Additional Information (Details) $ / shares in Units, € in Millions, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 18 Months Ended |  |  |  |  |
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Nov. 30, 2025 USD ($) location swap $ / shares shares | Nov. 30, 2024 USD ($) $ / shares shares | Nov. 30, 2025 USD ($) type swap location employee $ / shares shares | Nov. 30, 2024 USD ($) $ / shares shares | Nov. 30, 2025 USD ($) location swap | Nov. 30, 2025 EUR (€) location swap | Aug. 07, 2025 $ / shares | May 31, 2025 USD ($) | May 31, 2025 EUR (€) | May 31, 2024 USD ($) | Mar. 31, 2024 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross contract assets related to in-transit shipments | $ 759.0 |  | $ 759.0 |  | $ 759.0 |  |  | $ 673.0 |  |  |
Contract assets net of deferred unearned revenue | 643.0 |  | 643.0 |  | 643.0 |  |  | 526.0 |  |  |
Contract liabilities related to advance payments from customers | 22.0 |  | $ 22.0 |  | 22.0 |  |  | 23.0 |  |  |
Types of equity based compensation | type |  |  | 4 |  |  |  |  |  |  |  |
Stock-based compensation | 43.0 | $ 36.0 | $ 99.0 | $ 84.0 |  |  |  |  |  |  |
FedEx Freight spin-off costs | 205.0 |  | 248.0 |  |  |  |  |  |  |  |
FedEx Freight spin-off costs, net of tax | $ 171.0 |  | $ 204.0 |  |  |  |  |  |  |  |
FedEx Freight spin-off costs (in dollar per share) | $ / shares | $ 0.72 |  | $ 0.86 |  |  |  |  |  |  |  |
Fiscal year change | $ 8.0 |  | $ 12.0 |  |  |  |  |  |  |  |
Fiscal year change, net of tax | $ 6.0 |  | $ 9.0 |  |  |  |  |  |  |  |
Fiscal year change (in dollar per share) | $ / shares | $ 0.03 |  | $ 0.04 |  |  |  |  |  |  |  |
Business optimization costs | $ 30.0 | 326.0 | $ 97.0 | 454.0 |  |  |  |  |  |  |
Business optimization costs, net of tax | $ 25.0 | $ 249.0 | $ 77.0 | $ 347.0 |  |  |  |  |  |  |
Business optimization costs (in dollars per share) | $ / shares | $ 0.10 | $ 1.02 | $ 0.32 | $ 1.41 |  |  |  |  |  |  |
Consultation process expected occur period |  |  | 18 months |  |  |  |  |  |  |  |
Number of employees will affect in workforce reduction plan | employee |  |  | 1,400 |  |  |  |  |  |  |  |
Expected savings |  |  | $ 150.0 |  |  |  |  |  |  |  |
Restructuring costs | $ 6.0 | $ 173.0 | 9.0 | $ 176.0 | 250.0 |  |  |  |  |  |
Denominated debt as a net investment hedge | € |  |  |  |  |  | € 854 |  |  | € 506 |  |
Fair value of swaps classified as asset | 13.0 |  | 13.0 |  | 13.0 |  |  | 13.0 |  |  |
Fair value of swaps classified as liabilities | 96.0 |  | 96.0 |  | 96.0 |  |  | 108.0 |  |  |
Equity securities | 552.0 |  | 552.0 |  | 552.0 |  |  | 506.0 |  |  |
Debt securities | $ 187.0 |  | $ 187.0 |  | 187.0 |  |  | 70.0 |  |  |
Shares repurchased (in shares) | shares | 1.1 | 3.7 | 3.3 | 7.1 |  |  |  |  |  |  |
Payments for repurchase of common stock |  |  | $ 796.0 | $ 2,020.0 |  |  |  |  |  |  |
Cash dividend payable (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 1.45 |  |  |  |
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax | $ 14.0 | $ 13.0 | $ 2.0 | $ 7.0 |  |  |  |  |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized to be repurchased |  |  |  |  |  |  |  |  |  |  | $ 5,000.0
Shares repurchased (in shares) | shares | 1.2 | 3.7 | 3.3 | 7.1 |  |  |  |  |  |  |
Treasury stock acquired, average cost (in dollars per share) | $ / shares | $ 234.52 | $ 271.39 | $ 233.07 | $ 283.13 |  |  |  |  |  |  |
Payments for repurchase of common stock | $ 276.0 | $ 1,000.0 | $ 776.0 | $ 2,000.0 |  |  |  |  |  |  |
Stock repurchase program amount authorized to be repurchased, remaining available amount | 1,300.0 |  | 1,300.0 |  | 1,300.0 |  |  |  |  |  |
Supply Chain Finance |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding payment obligations | 118.0 | 104.0 | 118.0 | 104.0 | $ 118.0 |  |  | $ 71.0 |  | $ 94.0 |
Currency Swap |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recognized gain | $ 24.0 | $ 21.0 | $ 11.0 | $ 11.0 |  |  |  |  |  |  |
Number of swaps outstanding | swap | 4 |  | 4 |  | 4 | 4 |  |  |  |  |
Network 2.0 Optimization |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of business locations | location | 355 |  | 355 |  | 355 | 355 |  |  |  |  |
Separation and other costs |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
FedEx Freight spin-off costs | $ 205.0 |  | $ 246.0 |  |  |  |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
FedEx Freight spin-off costs |  |  | $ 2.0 |  |  |  |  |  |  |  |

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