Restructuring (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	$ (167,000)	$ 790,000	$ 10,418,000	$ 7,179,000
Impairment on right-of-use asset			6,200,000
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			5,957,000
Costs incurred			4,217,000
Cash disbursements			(9,672,000)
Non-cash charges			(11,000)
Balance as of June 30, 2020	491,000		491,000		$ 491,000
2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred			10,400,000		20,600,000
2018 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred		$ 800,000	0	$ 7,000,000.0	19,000,000.0
Employee Severance and Related Benefits
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			5,707,000
Costs incurred			4,168,000
Cash disbursements			(9,398,000)
Non-cash charges			0
Balance as of June 30, 2020	477,000		477,000		477,000
Software Charges
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			99,000
Costs incurred			0
Cash disbursements			(99,000)
Non-cash charges			0
Balance as of June 30, 2020	0		0		0
Other
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			151,000
Costs incurred			49,000
Cash disbursements			(175,000)
Non-cash charges			(11,000)
Balance as of June 30, 2020	$ 14,000		$ 14,000		$ 14,000