Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net of Accumulated Depreciation (Narrative) (Details)

v3.19.2
Property and Equipment, Net of Accumulated Depreciation (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
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)."