Acquisition of Real Estate (Narrative) (Details) (USD $) In Millions, unless otherwise specified		3 Months Ended
	Jul. 08, 2014 Raised Floor With Twelve MW Gross Power [Member] MW	Sep. 30, 2014 Princeton Facility [Member]	Jun. 30, 2014 Princeton Facility [Member] sqft acre	Jun. 30, 2014 Princeton Facility [Member] Raised Floor With Twelve MW Gross Power [Member] MW sqft	Jul. 08, 2014 Chicago Facility [Member] sqft acre	Sep. 30, 2014 Chicago Facility [Member] Scenario, Plan [Member] sqft	Jul. 08, 2014 Chicago Facility [Member] Raised Floor With Twelve MW Gross Power [Member] sqft	Sep. 30, 2014 Chicago Facility [Member] Raised Floor With Twelve MW Gross Power [Member] Scenario, Plan [Member] sqft MW
Business Acquisition [Line Items]
Aggregate costs related to acquisition			$ 73.3		$ 18.0
Acres of real estate property			194		30
Area of facility			560,000	58,000	317,000	400,000	133,000	215,000
Capacity of the plant	24			12				37
Lease period		10 years
Renewal of lease period		15 years