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Property and Equipment, Net of Accumulated Depreciation (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Aug. 31, 2018 USD ($) | Nov. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) ft² item | May 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Depreciation expense |  | $ 29.4 |  | $ 28.1 |  |
Cost of building purchased |  | 24.4 |  | $ 18.0 | [1] |
Multi-Building Campus [Member] | County Of Monroe Industrial Development Agency [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Public benefits and inducements expiration date | Dec. 31, 2039 |  |  |  |  |
Multi-Building Campus [Member] | Rochester, NY [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of buildings planned to be purchased | item |  |  |  | 5 |  |
Renovation square feet | ft² |  |  |  | 300,000 |  |
Cost of building purchased |  |  | $ 34.7 |  |  |
Construction in progress |  | 33.2 |  |  |  | $ 32.0
Escrow for building renovations |  |  | $ 16.0 |  |  |
Remaining balance in escrow |  | $ 4.4 |  |  |  | $ 14.2
[1] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.

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