Segment Reporting and Geographic Information (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 92,688	$ 103,542
UK
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	52,784	60,037
Greece [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	32,773	36,175
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	2,997	3,368
Rest of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 4,134	$ 3,962