Class of hedges exercise price of hedges.

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Percentage of premium on the common stock price to conversion price of convertible debt instruments.

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Debt Instrument Convertible Principal Amount

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Represents the default conditions pertaining to the percentage amount of the aggregate principle amount.

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Represents the in excess amount of due indebtedness, which constitutes debt default conditions.

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Represents the continuous period such event of default continues.

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Debt instrument settlement amount.

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Number of share options (or share units) issued upon exercise of warrants during the current period.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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

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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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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Earliest date when the debt instrument can be converted into equity, in CCYY-MM-DD format.

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Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

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Description of the conversion terms of a debt instrument which may include the conversion ratio (including all potential conversion ratios if contingently adjustable), type of debt or equity security into which the debt is convertible, the dollars of debt or the number of shares into which the instrument is convertible (or potentially convertible into), the conversion period, any contingencies associated with the conversion terms, and the existence and amount of a beneficial conversion feature.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount, after accumulated amortization, of debt discount.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Description of the type of derivative instrument, such as a swap, forward, and option. Excludes the underlying risk of the instrument.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Convertible Senior Notes - Narrative (Detail)	1 Months Ended						3 Months Ended		6 Months Ended
Convertible Senior Notes - Narrative (Detail)	Jul. 31, 2020 USD ($) shares	May 31, 2020 USD ($) shares	May 30, 2020 shares	Sep. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares $ / derivative shares	Jun. 30, 2015 USD ($) $ / shares $ / derivative shares	Aug. 01, 2020 USD ($) $ / shares	Aug. 03, 2019 USD ($)	Aug. 01, 2020 USD ($) $ / shares shares	Aug. 03, 2019 USD ($) shares	Feb. 01, 2020 USD ($)
Debt Instrument
Aggregate principal amount				$ 350,000,000
Debt instrument, principal amount							$ 350,000,000		$ 350,000,000		$ 350,000,000
Debt default conditions
Debt instrument, conversion principal amount				$ 1,000,000			1,000,000		1,000,000
Conversion price per share \| $ / shares				$ 211.40
Discounts and commissions payable							73,839,000		73,839,000		81,634,000
Amortization of debt issuance costs							100,000		300,000
Amortization of debt discount									25,378,000	$ 22,962,000
Debt amount settled in cash									215,846,000	278,560,000
(Gain) Loss on extinguishment of debt							152,000	$ 954,000	$ 152,000	$ 954,000
Convertible debt instrument conversion period two
Debt default conditions
Debt instrument, convertible trading days				5
Debt instrument, convertible consecutive trading days				10
Common Stock
Debt default conditions
Conversion price per share \| $ / shares					$ 193.65
Shares acquired from notes settlement \| shares									600	2,167,396
Convertible senior notes due 2024
Debt Instrument
Aggregate principal amount				$ 350,000,000
Debt instrument, interest rate				0.00%
Debt default conditions
Debt default, minimum aggregate principal amount							20,000,000		$ 20,000,000
Default event, continual period after written notice is delivered									30 days
Percentage of aggregate principal amount of notes outstanding									25.00%
Debt instrument, initial conversion rate				4.7304					100
Premium on stock trigger price				25.00%					100.00%
Debt instrument, convertible, stock price trigger \| $ / shares				$ 169.12					$ 169.12
Debt instrument, effective interest rate				5.74%
Discounts and commissions payable				$ 3,500,000
Third party offering costs				$ 1,300,000
Amortization of debt discount							3,900,000		$ 7,800,000
Shares issued upon conversion \| shares				1,656,000
Warrants price per share \| $ / shares				$ 338.24
Deferred tax liability							21,700,000		21,700,000
Deferred tax asset							$ 22,700,000		$ 22,700,000
Convertible senior notes due 2024 \| Convertible bond hedge and warrant transactions
Debt default conditions
Conversion price per share \| $ / shares				$ 211.40
Shares issued upon conversion \| shares				1,656,000
Convertible note hedge, number of shares				1,656,000
Total cost of convertible note hedge transactions				$ 91,400,000
Cash proceeds from sale of warrants				$ 50,200,000
Warrants price per share \| $ / shares				$ 338.24
Convertible senior notes due 2024 \| Convertible bond hedge and warrant transactions \| Maximum
Debt default conditions
Warrants sold to purchase common stock \| shares				3,300,000
Convertible senior notes due 2024 \| Convertible debt instrument conversion period one
Debt default conditions
Debt instrument, convertible trading days				20
Debt instrument, convertible consecutive trading days				30
Debt instrument, convertible percentage of stock price				130.00%
Convertible senior notes due 2024 \| Convertible debt instrument conversion period two
Debt default conditions
Premium on stock trigger price				98.00%
Convertible senior notes due 2024 \| Common Stock
Debt default conditions
Conversion price per share \| $ / shares							$ 211.40		$ 211.40
Convertible senior notes due 2023
Debt Instrument
Debt instrument, principal amount					$ 300,000,000		$ 335,000,000		$ 335,000,000		335,000,000
Debt default conditions
Debt default, minimum aggregate principal amount							20,000,000		$ 20,000,000
Default event, continual period after written notice is delivered									30 days
Percentage of aggregate principal amount of notes outstanding									25.00%
Debt instrument, maturity date									Jun. 15, 2023
Debt instrument, initial conversion rate									100
Conversion price per share \| $ / shares					$ 309.84
Deemed elected combination settlement amount per note to be received upon conversion							1,000,000		$ 1,000,000
Debt instrument, effective interest rate					6.35%
Discounts and commissions payable					$ 1,700,000		56,036,000		56,036,000		64,729,000
Third party offering costs					$ 4,600,000
Amortization of debt issuance costs							300,000	300,000	500,000	$ 500,000
Amortization of debt discount							4,400,000	4,100,000	$ 8,700,000	8,200,000
Warrants sold to purchase common stock \| shares					1,730,000
Cash proceeds from sale of warrants					$ 51,000,000.0
Warrants price per share \| $ / shares					$ 309.84
Convertible senior notes due 2023 \| Convertible bond hedge and warrant transactions
Debt default conditions
Convertible note hedge, number of shares					1,730,000
Convertible note hedge, price per share \| $ / derivative					193.65
Convertible note hedge, description									we entered into convertible note hedge transactions whereby we have the option to purchase a total of approximately 1.730 million shares of our common stock at a price of approximately $193.65 per share.
Total cost of convertible note hedge transactions					$ 91,900,000
Deferred tax liability							22,300,000		$ 22,300,000
Deferred tax asset							$ 22,500,000		$ 22,500,000
Convertible senior notes due 2023 \| Convertible bond hedge and warrant transactions \| Warrants Subject to Certain Adjustment Mechanisms \| Maximum
Debt default conditions
Warrants sold to purchase common stock \| shares					3,500,000
Convertible senior notes due 2023 \| Convertible debt instrument conversion period one
Debt default conditions
Debt instrument, convertible trading days					20
Debt instrument, convertible consecutive trading days					30
Debt instrument, convertible percentage of stock price					130.00%
Convertible senior notes due 2023 \| Convertible debt instrument conversion period two
Debt default conditions
Debt instrument, convertible trading days					5
Debt instrument, convertible consecutive trading days					10
Debt instrument, convertible percentage of stock price					98.00%
Convertible senior notes due 2023 \| Convertible debt instrument conversion period three
Debt default conditions
Debt instrument, convertible earliest date									Mar. 15, 2023
Convertible senior notes due 2023 \| Common Stock
Debt default conditions
Debt instrument, initial conversion rate					5.1640
Debt instrument, conversion principal amount					$ 1,000,000
Conversion price per share \| $ / shares							$ 193.65		$ 193.65
Debt instrument, conversion description									The initial conversion rate applicable to the 2023 Notes is 5.1640 shares of common stock per $1,000 principal amount of 2023 Notes, which is equivalent to an initial conversion price of approximately $193.65 per share.
Convertible senior notes due 2020
Debt Instrument
Debt instrument, principal amount						$ 250,000,000					300,000,000
Debt default conditions
Debt instrument, maturity date									Jul. 15, 2020
Debt instrument, convertible earliest date									Mar. 15, 2020
Debt instrument, effective interest rate						6.47%
Discounts and commissions payable						$ 3,800,000					$ 8,890,000
Third party offering costs						$ 2,300,000
Amortization of debt issuance costs							$ 300,000		$ 600,000	$ 600,000
Amortization of debt discount							$ 4,200,000	$ 4,500,000	$ 8,900,000
Debt amount settled in cash	$ 290,600,000	$ 9,200,000
Aggregate amounts outstanding	$ 290,600,000	$ 9,400,000
Shares issued upon conversion \| shares	1,116,718	14,927	14,927
(Gain) Loss on extinguishment of debt	$ 0	$ 200,000
Warrants sold to purchase common stock \| shares						2,540,000
Cash proceeds from sale of warrants						$ 30,400,000
Warrants price per share \| $ / shares						$ 189.00
Deferred tax liability						$ 32,800,000
Shares issued upon exercise of warrants \| shares	1,116,735
Deferred tax asset						$ 26,600,000
Shares acquired from notes settlement \| shares									17
Convertible senior notes due 2020 \| Convertible bond hedge and warrant transactions
Debt default conditions
Conversion price per share \| $ / shares						$ 189.00
Convertible note hedge, number of shares						2,540,000
Convertible note hedge, price per share \| $ / derivative						118.13
Convertible note hedge, description									we entered into convertible note hedge transactions whereby we had the option to purchase a total of approximately 2.540 million shares of our common stock at a price of approximately $118.13 per share.
Total cost of convertible note hedge transactions						$ 68,300,000
Convertible senior notes due 2020 \| Convertible bond hedge and warrant transactions \| Warrants Subject to Certain Adjustment Mechanisms \| Maximum
Debt default conditions
Warrants sold to purchase common stock \| shares						5,100,000
Convertible senior notes due 2020 \| Convertible debt instrument conversion period one
Debt default conditions
Debt instrument, convertible trading days						20
Debt instrument, convertible consecutive trading days						30
Debt instrument, convertible percentage of stock price						130.00%
Convertible senior notes due 2020 \| Convertible debt instrument conversion period two
Debt default conditions
Debt instrument, conversion principal amount						$ 1,000,000
Debt instrument, convertible trading days						5
Debt instrument, convertible consecutive trading days						10
Debt instrument, convertible percentage of stock price						98.00%
Convertible senior notes due 2020 \| Common Stock
Debt default conditions
Debt instrument, initial conversion rate						8.4656
Debt instrument, conversion principal amount						$ 1,000,000
Conversion price per share \| $ / shares							$ 118.13		$ 118.13
Debt instrument, conversion description									The initial conversion rate applicable to the 2020 Notes was 8.4656 shares of common stock per $1,000 principal amount of 2020 Notes, which was equivalent to an initial conversion price of approximately $118.13 per share.
Convertible senior notes due 2019
Debt default conditions
Aggregate amounts outstanding							$ 0		$ 0
Private Placement \| Convertible senior notes due 2024
Debt Instrument
Debt instrument, interest rate				0.00%
Private Placement \| Convertible senior notes due 2023
Debt Instrument
Aggregate principal amount					$ 335,000,000
Debt instrument, interest rate					0.00%
Private Placement \| Convertible senior notes due 2020
Debt Instrument
Aggregate principal amount						$ 300,000,000
Debt instrument, interest rate						0.00%
Over Allotment Option in Private Placement \| Convertible senior notes due 2023
Debt Instrument
Debt instrument, principal amount					$ 35,000,000
Over Allotment Option in Private Placement \| Convertible senior notes due 2020
Debt Instrument
Debt instrument, principal amount						$ 50,000,000