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Property and Equipment, Net of Accumulated Depreciation (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2018 USD ($) ft² | Nov. 30, 2017 USD ($) item | Nov. 30, 2018 USD ($) ft² | Nov. 30, 2017 USD ($) | May 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Depreciation expense | $ 30.2 | $ 28.4 |  | $ 56.5 |  |
Cost of building purchased |  |  | $ 60.8 | $ 95.5 | [1] |
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 |  |  |  |
Construction in progress |  |  |  |  |  | $ 32.0
Escrow for building renovations |  | $ 16.0 |  |  |  |
Remaining balance in escrow | $ 1.5 |  | $ 1.5 |  |  | $ 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 ASC Topic 606.

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