Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Restructuring costs reserve [Roll Forward]
Restructuring reserve balance	$ 900
Restructuring costs	$ 320	$ 0	$ (14,000)

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration