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Acquisitions - Aggregate Purchase Price and Fair Value Allocations (Details) - USD ($) $ in Thousands | May 31, 2019 | May 31, 2018 | May 31, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Net goodwill recognized | $ 2,842,441 | $ 2,846,888 | $ 2,782,335
Series of Individually Immaterial Business Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of tangible assets acquired | 840 | 421 |
Net goodwill recognized | 6,637 | 12,094 |
Total fair value of assets acquired | 16,576 | 22,678 |
Fair value of liabilities assumed | 6,763 | 3,332 |
Total cash paid for acquisitions, net of cash acquired | 9,813 | 19,346 |
Series of Individually Immaterial Business Acquisitions | Service contracts |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of intangible assets acquired | 8,064 | 9,271 |
Series of Individually Immaterial Business Acquisitions | Other intangibles |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of intangible assets acquired | $ 1,035 | $ 892 |

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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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