Restructuring (Details) - USD ($)	3 Months Ended		6 Months Ended	18 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	$ 10,585,000	$ 6,389,000
Impairment on right-of-use asset	6,200,000
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020	5,957,000
Costs incurred	4,384,000
Cash disbursements	(4,171,000)
Non-cash charges	(11,000)
Balance as of March 31, 2020	6,159,000		$ 6,159,000	$ 6,159,000
2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	10,600,000		20,800,000
2018 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	0	$ 6,200,000		19,000,000.0
Employee Severance and Related Benefits
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020	5,707,000
Costs incurred	4,356,000
Cash disbursements	(3,935,000)
Non-cash charges	0
Balance as of March 31, 2020	6,128,000		6,128,000	6,128,000
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 March 31, 2020	0		0	0
Other
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020	151,000
Costs incurred	28,000
Cash disbursements	(137,000)
Non-cash charges	(11,000)
Balance as of March 31, 2020	$ 31,000		$ 31,000	$ 31,000