Related Party Transaction (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Related Party Transaction [Line Items]
Document Period End Date	Mar. 31, 2018
Contingent And Deferred Acquisition Payments	$ 20,926	$ 28,860
Magnet [Member]
Related Party Transaction [Line Items]
Payments to Acquire Other Productive Assets	5,000
Technology Services Costs	2,000
Contingent And Deferred Acquisition Payments	1,500
Cash Distribution [Member] | Magnet [Member]
Related Party Transaction [Line Items]
Payments to Acquire Other Productive Assets	3,500
Liability [Member] | Magnet [Member]
Related Party Transaction [Line Items]
Payments to Acquire Other Productive Assets	$ 1,500