Class of hedges exercise price of hedges.

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Debt instrument settlement amount.

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Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit).

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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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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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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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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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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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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.

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Convertible Senior Notes - Additional Information (Detail)		1 Months Ended		12 Months Ended
	Jun. 18, 2014 USD ($) d Derivative $ / shares $ / Derivative shares	Jun. 30, 2018 USD ($) d Derivative $ / shares $ / Derivative shares	Jun. 30, 2015 USD ($) d Derivative $ / shares $ / Derivative shares	Feb. 02, 2019 USD ($) $ / shares	Feb. 03, 2018 USD ($)	Jan. 28, 2017 USD ($)	Jul. 31, 2015 USD ($)
Debt Instrument [Line Items]
Amortization of debt discount				$ 41,868,000	$ 30,457,000	$ 28,822,000
Total cost of convertible note hedge transactions				91,857,000
Cash proceeds from sale of warrants				$ 51,021,000
Tax act, provisional income tax expense (benefit)					$ 7,000,000
U.S. corporate income tax rate				21.00%	33.70%	35.00%
Maximum [Member]
Debt Instrument [Line Items]
U.S. corporate income tax rate					35.00%
Convertible Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 335,000,000
Deemed elected combination settlement amount per note to be received upon conversion		$ 1,000
Debt instrument, effective interest rate		6.35%
Discounts and commissions payable		$ 1,700,000		81,311,000
Third party offering costs		$ 4,600,000
Amortization of debt issuance costs				500,000
Amortization of debt discount				$ 9,700,000
Warrants sold to purchase common stock \| shares		1,700,000
Cash proceeds from sale of warrants		$ 51,000,000
Warrants price per share \| $ / shares		$ 309.84
Convertible Senior Notes Due 2023 [Member] \| Convertible Bond Hedge and Warrant Transactions [Member]
Debt Instrument [Line Items]
Conversion price per share \| $ / shares		$ 309.84
Convertible note hedge, number of shares \| Derivative		1,700,000
Convertible note hedge, price per share \| $ / Derivative		193.65
Convertible note hedge, description				The Company entered into convertible note hedge transactions whereby the Company has the option to purchase a total of approximately 1.7 million shares of its common stock at a price of approximately $193.65 per share.
Convertible note hedge, inception Date				Jun. 30, 2018
Total cost of convertible note hedge transactions		$ 91,900,000
Deferred tax liability				$ 22,300,000
Deferred tax asset				$ 22,500,000
Convertible Senior Notes Due 2023 [Member] \| Convertible Bond Hedge and Warrant Transactions [Member] \| Warrants Subject to Certain Adjustment Mechanisms [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Warrants sold to purchase common stock \| shares		3,500,000
Convertible Senior Notes Due 2023 [Member] \| Convertible Debt Instrument Conversion Period One [Member]
Debt Instrument [Line Items]
Debt instrument, convertible trading days \| d		20
Debt instrument, convertible consecutive trading days \| d		30
Debt instrument, convertible percentage of stock price		130.00%
Convertible Senior Notes Due 2023 [Member] \| Convertible Debt Instrument Conversion Period Two [Member]
Debt Instrument [Line Items]
Debt instrument, convertible trading days \| d		5
Debt instrument, convertible consecutive trading days \| d		10
Debt instrument, convertible percentage of stock price		98.00%
Convertible Senior Notes Due 2023 [Member] \| Convertible Debt Instrument Conversion Period Three [Member]
Debt Instrument [Line Items]
Debt instrument, convertible earliest date				Mar. 15, 2023
Convertible Senior Notes Due 2023 [Member] \| Common Stock [Member]
Debt Instrument [Line Items]
Debt instrument, initial conversion rate		5.1640
Debt instrument, conversion principal amount		$ 1,000
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 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 300,000,000	$ 300,000,000
Deemed elected combination settlement amount per note to be received upon conversion			$ 1,000
Debt instrument, effective interest rate			6.47%
Discounts and commissions payable			$ 3,800,000	27,081,000	44,135,000
Third party offering costs			$ 2,300,000
Amortization of debt issuance costs				1,100,000	1,000,000	$ 1,000,000
Amortization of debt discount				$ 17,100,000	16,000,000	15,000,000
Warrants sold to purchase common stock \| shares			2,500,000
Cash proceeds from sale of warrants			$ 30,400,000
Warrants price per share \| $ / shares			$ 189.00
Convertible Senior Notes Due 2020 [Member] \| Convertible Bond Hedge and Warrant Transactions [Member]
Debt Instrument [Line Items]
Conversion price per share \| $ / shares			$ 189.00
Convertible note hedge, number of shares \| Derivative			2,500,000
Convertible note hedge, price per share \| $ / Derivative			118.13
Convertible note hedge, description				The Company entered into convertible note hedge transactions whereby the Company has the option to purchase a total of approximately 2.5 million shares of its common stock at a price of approximately $118.13 per share
Convertible note hedge, inception Date				Jun. 30, 2015
Total cost of convertible note hedge transactions			$ 68,300,000
Deferred tax liability				$ 32,800,000
Deferred tax asset				$ 26,600,000
Tax act, provisional income tax expense (benefit)					(1,100,000)
Convertible Senior Notes Due 2020 [Member] \| Convertible Bond Hedge and Warrant Transactions [Member] \| Warrants Subject to Certain Adjustment Mechanisms [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Warrants sold to purchase common stock \| shares			5,100,000
Convertible Senior Notes Due 2020 [Member] \| Convertible Debt Instrument Conversion Period One [Member]
Debt Instrument [Line Items]
Debt instrument, convertible trading days \| d			20
Debt instrument, convertible consecutive trading days \| d			30
Debt instrument, convertible percentage of stock price			130.00%
Convertible Senior Notes Due 2020 [Member] \| Convertible Debt Instrument Conversion Period Two [Member]
Debt Instrument [Line Items]
Debt instrument, convertible trading days \| d			5
Debt instrument, convertible consecutive trading days \| d			10
Debt instrument, convertible percentage of stock price			98.00%
Convertible Senior Notes Due 2020 [Member] \| Convertible Debt Instrument Conversion Period Three [Member]
Debt Instrument [Line Items]
Debt instrument, convertible earliest date				Mar. 15, 2020
Convertible Senior Notes Due 2020 [Member] \| Common Stock [Member]
Debt Instrument [Line Items]
Debt instrument, initial conversion rate			8.4656
Debt instrument, conversion principal amount			$ 1,000
Conversion price per share \| $ / shares			$ 118.13	$ 118.13
Debt instrument, conversion description				The initial conversion rate applicable to the 2020 Notes is 8.4656 shares of common stock per $1,000 principal amount of 2020 Notes, which is equivalent to an initial conversion price of approximately $118.13 per share.
Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 350,000,000	350,000,000
Debt instrument, convertible earliest date				Mar. 15, 2019
Deemed elected combination settlement amount per note to be received upon conversion	$ 1,000
Debt instrument, effective interest rate	4.51%
Discounts and commissions payable	$ 4,400,000			$ 5,854,000	20,988,000
Third party offering costs	$ 1,000,000
Amortization of debt issuance costs				900,000	900,000	800,000
Amortization of debt discount				$ 15,100,000	14,500,000	$ 13,800,000
Warrants sold to purchase common stock \| shares	3,000,000
Cash proceeds from sale of warrants	$ 40,400,000
Warrants price per share \| $ / shares	$ 171.98
Convertible Senior Notes Due 2019 [Member] \| Convertible Bond Hedge and Warrant Transactions [Member]
Debt Instrument [Line Items]
Convertible note hedge, number of shares \| Derivative	3,000,000
Convertible note hedge, price per share \| $ / Derivative	116.09
Convertible note hedge, description				The Company entered into convertible note hedge transactions whereby the Company has the option to purchase a total of approximately 3.0 million shares of its common stock at a price of approximately $116.09 per share.
Total cost of convertible note hedge transactions	$ 73,300,000
Deferred tax liability				$ 27,500,000
Deferred tax asset				$ 28,600,000
Tax act, provisional income tax expense (benefit)					$ 100,000
Conversion price per share, two \| $ / shares	$ 171.98
Convertible Senior Notes Due 2019 [Member] \| Convertible Bond Hedge and Warrant Transactions [Member] \| Warrants Subject to Certain Adjustment Mechanisms [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Warrants sold to purchase common stock \| shares	6,000,000
Convertible Senior Notes Due 2019 [Member] \| Convertible Debt Instrument Conversion Period One [Member]
Debt Instrument [Line Items]
Debt instrument, convertible trading days \| d	20
Debt instrument, convertible consecutive trading days \| d	30
Debt instrument, convertible percentage of stock price	130.00%
Convertible Senior Notes Due 2019 [Member] \| Convertible Debt Instrument Conversion Period Two [Member]
Debt Instrument [Line Items]
Debt instrument, convertible trading days \| d	5
Debt instrument, convertible consecutive trading days \| d	10
Debt instrument, convertible percentage of stock price	98.00%
Convertible Senior Notes Due 2019 [Member] \| Convertible Debt Instrument Conversion Period Three [Member]
Debt Instrument [Line Items]
Debt instrument, convertible earliest date				Mar. 15, 2019
Convertible Senior Notes Due 2019 [Member] \| Common Stock [Member]
Debt Instrument [Line Items]
Debt instrument, initial conversion rate	8.6143
Debt instrument, conversion principal amount	$ 1,000
Conversion price per share \| $ / shares	$ 116.09			$ 116.09
Debt instrument, conversion description				The initial conversion rate applicable to the 2019 Notes is 8.6143 shares of common stock per $1,000 principal amount of 2019 Notes, which is equivalent to an initial conversion price of approximately $116.09 per share
Private Placement [Member] \| Convertible Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount		$ 300,000,000
Debt instrument, interest rate		0.00%
Debt instrument, maturity date				Jun. 15, 2023
Private Placement [Member] \| Convertible Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 250,000,000
Debt instrument, interest rate			0.00%
Debt instrument, maturity date				Jul. 15, 2020
Private Placement [Member] \| Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 350,000,000
Debt instrument, interest rate	0.00%
Debt instrument, maturity date				Jun. 15, 2019
Over Allotment Option in Private Placement [Member] \| Convertible Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount		$ 35,000,000
Exercise of Over Allotment Option in Private Placement [Member] \| Convertible Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount							$ 50,000,000