Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Number of warrants or rights outstanding.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 470
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt.

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-Publisher FASB
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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Convertible Senior Notes - Bond Hedges and Warrant Transactions Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			9 Months Ended
	May 31, 2021	Nov. 30, 2020	Feb. 28, 2018	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Payments for warrants related to convertible notes				$ 19,655	$ 0
Shares subject to warrants related to the issuance of the 2023 Notes \| Convertible Debt
Debt Instrument [Line Items]
Number of bond hedges and warrants issued, subject to anti-dilution adjustments (in shares)				100,000
Bond Hedge
Debt Instrument [Line Items]
Payments for hedge			$ (41,700)
Bond Hedge \| Shares subject to warrants related to the issuance of the 2023 Notes \| Convertible Debt
Debt Instrument [Line Items]
Number of bond hedges and warrants issued, subject to anti-dilution adjustments (in shares)	100,000		900,000
Conversion price (usd per share)				$ 57.38
Number of securities called by warrants (in shares)		700,000
Proceeds from Issuance of Warrants	$ 26,300	$ 171,700
Warrant Transaction
Debt Instrument [Line Items]
Number of bond hedges and warrants issued, subject to anti-dilution adjustments (in shares)			4,000,000
Proceeds from Issuance of Warrants			$ 22,400
Warrant strike price (usd per share)				$ 78.75
Warrant Transaction \| Shares subject to warrants related to the issuance of the 2023 Notes \| Convertible Debt
Debt Instrument [Line Items]
Number of bond hedges and warrants issued, subject to anti-dilution adjustments (in shares)	600,000			200,000
Proceeds from Issuance of Warrants	$ 19,700	3,200
Payments for warrants related to convertible notes		$ 137,500