Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Sep. 30, 2018	Jun. 30, 2019
Schedule of changes in the carrying amount of goodwill
Goodwill, beginning balance	$ 339,566	$ 339,566
Impairment	$ (339,600)	$ (339,566)

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration