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Property and Equipment, Net of Accumulated Depreciation (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Oct. 05, 2017 USD ($) item | Sep. 30, 2017 | Aug. 31, 2017 USD ($) ft² item | Aug. 31, 2017 USD ($) ft² item | Aug. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciation expense |  |  |  | $ 28.1 | $ 25.3
Cost of building purchased |  |  |  | $ 18.0 | $ 20.3
Multi-Building Campus [Member] | Subsequent Event [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 | 5 |
Renovation square feet | ft² |  |  | 300,000 | 300,000 |
Estimated cost of building to be purchased |  |  | $ 60.0 |  |
Multi-Building Campus [Member] | Rochester, NY [Member] | Subsequent Event [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Number of buildings purchased | item | 2 |  |  |  |
Cost of building purchased | $ 19.5 |  |  |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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