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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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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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Date the entity entered into the derivative contract, in CCYY-MM-DD format.

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Period Type:

Convertible Senior Notes - Additional Information (Detail)		1 Months Ended			3 Months Ended
	Jun. 30, 2015 USD ($) $ / shares $ / derivative shares	Jun. 30, 2018 USD ($) $ / shares $ / derivative shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) derivative $ / shares $ / derivative	May 04, 2019 USD ($) $ / shares	May 05, 2018 USD ($)	Sep. 30, 2014 USD ($) shares	Feb. 02, 2019 USD ($)	Jul. 31, 2015 USD ($)	Jun. 18, 2014 $ / shares
Debt Instrument
Amortization of debt discount					$ 12,377,000	$ 7,881,000
Convertible senior notes due 2023
Debt Instrument
Debt instrument, principal amount					335,000,000			$ 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			77,264,000			81,311,000
Third party offering costs		$ 4,600,000
Amortization of debt issuance costs					200,000
Amortization of debt discount					$ 4,100,000
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 \| Convertible Bond Hedge and Warrant Transactions
Debt Instrument
Convertible note hedge, number of shares		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
Warrants price per share \| $ / shares		$ 309.84
Deferred tax liability					$ 22,300,000
Deferred tax asset					$ 22,500,000
Convertible senior notes due 2023 \| Convertible Bond Hedge and Warrant Transactions \| Warrants Subject to Certain Adjustment Mechanisms \| Maximum
Debt Instrument
Warrants sold to purchase common stock \| shares		3,500,000
Convertible senior notes due 2023 \| Convertible Debt Instrument Conversion Period One
Debt Instrument
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 Instrument
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 Instrument
Debt instrument, convertible earliest date					Mar. 15, 2023
Convertible senior notes due 2023 \| Common Stock
Debt Instrument
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
Debt Instrument
Debt instrument, principal amount					$ 300,000,000			300,000,000
Deemed elected combination settlement amount per note to be received upon conversion	$ 1,000		$ 1,000
Debt instrument, effective interest rate	6.47%		6.47%
Discounts and commissions payable	$ 3,800,000		$ 3,800,000		22,642,000			27,081,000
Third party offering costs	$ 2,300,000		$ 2,300,000
Amortization of debt issuance costs					300,000	300,000
Amortization of debt discount					$ 4,400,000	4,200,000
Warrants sold to purchase common stock \| shares	2,500,000		2,500,000
Cash proceeds from sale of warrants			$ 30,400,000
Warrants price per share \| $ / shares	$ 189.00		$ 189.00
Convertible senior notes due 2020 \| Convertible Bond Hedge and Warrant Transactions
Debt Instrument
Conversion price per share \| $ / shares	$ 189.00		$ 189.00
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.
Total cost of convertible note hedge transactions	$ 68,300,000
Deferred tax liability					$ 32,800,000
Deferred tax asset					$ 26,600,000
Convertible senior notes due 2020 \| Convertible Bond Hedge and Warrant Transactions \| Warrants Subject to Certain Adjustment Mechanisms \| Maximum
Debt Instrument
Warrants sold to purchase common stock \| shares	5,100,000		5,100,000
Convertible senior notes due 2020 \| Convertible Debt Instrument Conversion Period One
Debt Instrument
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 Instrument
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 Instrument
Debt instrument, principal amount	$ 1,000		$ 1,000
Debt instrument, initial conversion rate			8.4656
Conversion price per share \| $ / shares	$ 118.13		$ 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
Debt Instrument
Debt instrument, principal amount					$ 350,000,000			350,000,000
Debt instrument, convertible earliest date					Mar. 15, 2019
Debt instrument, effective interest rate				4.51%
Discounts and commissions payable				$ 4,400,000	$ 1,963,000			$ 5,854,000
Third party offering costs				$ 1,000,000
Amortization of debt issuance costs					200,000	200,000
Amortization of debt discount					$ 3,900,000	$ 3,700,000
Convertible note hedge, number of shares \| derivative				3,000,000
Cash proceeds from sale of warrants							$ 40,400,000
Convertible senior notes due 2019 \| Convertible Bond Hedge and Warrant Transactions
Debt Instrument
Convertible note hedge, number of shares				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
Warrants price per share \| $ / shares				$ 171.98
Deferred tax liability					$ 27,500,000
Deferred tax asset					$ 28,600,000
Conversion price per share, two \| $ / shares				$ 171.98
Convertible senior notes due 2019 \| Convertible Bond Hedge and Warrant Transactions \| Warrants Subject to Certain Adjustment Mechanisms \| Maximum
Debt Instrument
Warrants sold to purchase common stock \| shares							6,000,000
Convertible senior notes due 2019 \| Convertible Debt Instrument Conversion Period One
Debt Instrument
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 2019 \| Convertible Debt Instrument Conversion Period Two
Debt Instrument
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 2019 \| Common Stock
Debt Instrument
Debt instrument, initial conversion rate				8.6143
Debt instrument, conversion principal amount				$ 1,000
Conversion price per share \| $ / shares					$ 116.09					$ 116.09
Private Placement \| Convertible senior notes due 2023
Debt Instrument
Debt instrument, principal amount		$ 300,000,000
Debt instrument, interest rate		0.00%
Debt instrument, maturity date		Jun. 15, 2023
Private Placement \| Convertible senior notes due 2020
Debt Instrument
Debt instrument, principal amount	$ 250,000,000		$ 250,000,000
Debt instrument, interest rate	0.00%		0.00%
Debt instrument, maturity date					Jul. 15, 2020
Private Placement \| Convertible senior notes due 2019
Debt Instrument
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 \| Convertible senior notes due 2023
Debt Instrument
Debt instrument, principal amount		$ 35,000,000
Exercise of Over Allotment Option in Private Placement \| Convertible senior notes due 2020
Debt Instrument
Debt instrument, principal amount									$ 50,000,000