Restructuring Expenses - Additional Information (Details)	3 Months Ended
	Dec. 31, 2019 USD ($) position	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Expense Additions	$ 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