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v3.19.1

Property and Equipment, Net of Accumulated Depreciation (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2019 USD ($) ft² | Feb. 28, 2018 USD ($) | Nov. 30, 2017 USD ($) item | Feb. 28, 2019 USD ($) ft² | Feb. 28, 2018 USD ($) | May 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Depreciation expense |  | $ 32.1 | $ 31.5 |  | $ 91.7 | $ 88.0 |  |
Cost of building purchased | [1] |  |  |  | 88.0 | $ 122.0 | [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 |  |  |  |
Remaining balance in escrow |  | $ 0.0 |  |  | $ 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 |  |  | 300,000 |  |  |
[1] | 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)."
[2] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.

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