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

Restructuring Expenses - Additional Information (Details)	3 Months Ended		9 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) position	Jun. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Expense Additions	$ 0	$ 0	$ 3,104,000	$ 0
Number of positions eliminated \| position			69
Facilities charges
Restructuring Cost and Reserve [Line Items]
Expense Additions			$ 0
Employee separation
Restructuring Cost and Reserve [Line Items]
Expense Additions			$ 3,104,000