Property And Equipment (Narrative) (Details) $ in Millions		3 Months Ended
	Jun. 13, 2018 AUD ($) m²	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Jun. 29, 2018 m²	Jun. 29, 2018 ft²	Jun. 29, 2018 AUD ($)	Jun. 29, 2018 m	Jun. 29, 2018 ft	Jun. 29, 2018 USD ($)	Jun. 13, 2018 ft²
Property, Plant and Equipment [Line Items]
Depreciation expense for operating property | $		$ 5.4	$ 4.7
Land At Cannon Park, Australia [Member]
Property, Plant and Equipment [Line Items]
Area of property	15,150									163,000
Payment to acquire property | $	$ 1
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