Property And Equipment (Narrative) (Details) $ in Millions								3 Months Ended		9 Months Ended
	Jun. 13, 2018 AUD ($) m²	Dec. 14, 2017 AUD ($)	Dec. 14, 2017 USD ($)	Jun. 19, 2017 AUD ($)	Jun. 19, 2017 USD ($)	May 23, 2014 AUD ($)	May 23, 2014 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 29, 2018 m²	Jun. 29, 2018 ft²	Jun. 29, 2018 m	Jun. 29, 2018 ft	Jun. 29, 2018 AUD ($)	Jun. 29, 2018 USD ($)	Jun. 13, 2018 ft²	Dec. 31, 2017 AUD ($)	Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation expense for operating property | $								$ 5.4	$ 4.0	$ 15.6	$ 11.8
Land At Cannon Park, Australia [Member]
Property, Plant and Equipment [Line Items]
Payment to acquire property | $	$ 1
Area of property	15,150																	163,000
Property In Auburn, Australia [Member]
Property, Plant and Equipment [Line Items]
Sale price																$ 4,500,000	$ 3.5
Building [Member] | Property In Auburn, Australia [Member]
Property, Plant and Equipment [Line Items]
Area of property | ft²													16,830
Land [Member] | Property In Auburn, Australia [Member]
Property, Plant and Equipment [Line Items]
Area of property | ft²													20,870
Redyard ETC [Member] | Land [Member] | Property In Auburn, Australia [Member]
Property, Plant and Equipment [Line Items]
Area of property												48,309	519,992
Length of frontage														498	1,620
Disposal Group, Not Discontinued Operations [Member] | Burwood [Member]
Property, Plant and Equipment [Line Items]
Proceeds from the sale property		$ 36,600,000	$ 28.1	$ 21,800,000	$ 16.6	$ 6,500,000	$ 5.9
Sale price																			$ 65,000,000	$ 50.6