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Debt - Narrative (Details)		1 Months Ended		3 Months Ended		6 Months Ended
	Jan. 01, 2021 USD ($)	Sep. 30, 2019 USD ($) D $ / shares	Aug. 31, 2015 USD ($) D $ / shares	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 14, 2021 USD ($)	Dec. 31, 2021 USD ($)
Long-term debt
Long-term debt				$ 282,176,000			$ 281,894,000
Current portion of long-term debt				149,721,000			149,540,000
Additional paid-in capital				2,152,639,000			2,123,606,000
1.50% Convertible senior notes due 2026
Long-term debt
Term of the convertible notes	7 years
Debt discount to be amortized	$ 0
Incremental interest rate per annum						0.50%
Interest expense				1,352,000	$ 1,346,000	$ 2,100,000
3.00% Convertible senior notes due 2022
Long-term debt
Term of the convertible notes	7 years
Debt discount to be amortized	$ 0
Convertible debt | 1.50% Convertible senior notes due 2026
Long-term debt
Net carrying amount				282,176,000			281,894,000
Debt principal amount		$ 287,500,000		$ 287,500,000			287,500,000
Debt instrument additional amount available for repurchase		$ 37,500,000
Interest rate ( as a percent )		1.50%		1.50%
Net proceeds from issuance of convertible notes		$ 279,300,000
Trading days, number | D		20
Consecutive trading days, period | D		30
Stock price trigger		130.00%
Business days, period		5 days
Consecutive trading-day period		5 days
Maximum product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day		98.00%
Conversion ratio		19.0404
Conversion price per share (in dollars per share) | $ / shares		$ 52.52
Convertible instruments principal and unpaid interest payable upon events of default		100.00%
Minimum percentage of principal held by convertible debt instrument holders required to issue notice for declaration of principal and unpaid interest payable upon events of default		25.00%
Term of the convertible notes		7 years	7 years	4 years 6 months
Equity component of convertible notes, net		$ 123,000,000.0
Net deferred tax liability in connection with convertible notes				$ 25,300,000
Convertible debt | 1.50% Convertible senior notes due 2026 | Redemption on or after September 20, 2023
Long-term debt
Trading days, number | D		19
Consecutive trading days, period | D		30
Stock price trigger		130.00%
Redemption price as percent of principal amount		100.00%
Sinking fund		$ 0
Convertible debt | 3.00% Convertible senior notes due 2022
Long-term debt
Net carrying amount				149,721,000			149,540,000
Debt principal amount			$ 150,000,000.0	$ 150,000,000			$ 150,000,000
Interest rate ( as a percent )			3.00%
Net proceeds from issuance of convertible notes			$ 145,400,000
Trading days, number | D			20
Stock price trigger			130.00%
Business days, period			5 days
Consecutive trading-day period			5 days
Maximum product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day			98.00%
Conversion ratio			17.7487
Conversion price per share (in dollars per share) | $ / shares			$ 56.34
Convertible instruments principal and unpaid interest payable upon events of default			100.00%
Minimum percentage of principal held by convertible debt instrument holders required to issue notice for declaration of principal and unpaid interest payable upon events of default			25.00%
Term of the convertible notes			7 years
Equity component of convertible notes, net			$ 57,500,000
Net deferred tax liability in connection with convertible notes			$ 22,300,000
Remaining contractual life of the convertible notes				4 months 24 days
Interest expense				$ 1,291,000	$ 1,285,000
Convertible debt | 3.00% Convertible senior notes due 2022 | Redemption on or after August 20, 2018
Long-term debt
Trading days, number | D			19
Consecutive trading days, period | D			30
Stock price trigger			130.00%
Redemption price as percent of principal amount			100.00%
Redemptions of convertible notes				$ 0
Sinking fund			$ 0
Cumulative Effect Adjustment | 1.50% Convertible senior notes due 2026
Long-term debt
Additional paid-in capital	(123,000,000.0)
Amortization of debt discount	16,100,000
Cumulative Effect Adjustment | 3.00% Convertible senior notes due 2022
Long-term debt
Additional paid-in capital	(57,500,000)
Amortization of debt discount	$ 38,700,000

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