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Acquisitions and Divestitures - Aggregate Purchase Price for Businesses Acquired (Details) - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017 | May 31, 2016
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Net goodwill recognized | $ 2,846,888 | $ 2,782,335 | $ 1,276,076
Series of Business Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of tangible assets acquired | 421 | 550,491 |
Net goodwill recognized | 12,094 | 1,507,554 |
Total fair value of assets acquired | 22,678 | 2,604,836 |
Fair value of liabilities assumed | 3,332 | 502,465 |
Total cash paid for acquisitions, net of cash acquired | 19,346 | 2,102,371 |
Series of Business Acquisitions | Service contracts |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of intangible assets acquired | 9,271 | 529,235 |
Series of Business Acquisitions | Other intangibles |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of intangible assets acquired | $ 892 | $ 17,556 |

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