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Property and Equipment, Net of Accumulated Depreciation (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
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Nov. 30, 2017 USD ($) ft² item | May 31, 2019 USD ($) | May 31, 2018 USD ($) | May 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Depreciation expense |  | $ 125.7 | $ 116.9 |  | $ 108.8 |
Cost of building purchased |  | 123.8 | 154.0 | [1],[2] | $ 94.3 | [1],[2]
Multi-Building Campus [Member] | Rochester, NY [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of buildings purchased | item | 5 |  |  |  |  |
Cost of building purchased | $ 34.7 |  |  |  |  |
Escrow for building renovations | $ 16.0 | $ 0.0 | $ 14.2 |  |  |
Multi-Building Campus [Member] | Rochester, NY [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Renovation square feet | ft² | 300,000 |  |  |  |  |
[1] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.
[2] | Amounts have been adjusted to reflect the adoption of Accounting Standards Update ("ASU") No. 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force)."

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: 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=109223946&loc=d3e3602-108585 + Details
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