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

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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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Convertible Senior Notes - Additional Information (Detail)	1 Months Ended			3 Months Ended		9 Months Ended
	Jun. 30, 2018 USD ($) d Derivative $ / shares $ / Derivative shares	Jun. 30, 2015 USD ($) d Derivative $ / shares $ / Derivative shares	Jun. 30, 2014 USD ($) d Derivative $ / shares $ / Derivative shares	Nov. 03, 2018 USD ($) $ / shares	Oct. 28, 2017 USD ($)	Nov. 03, 2018 USD ($) $ / shares	Oct. 28, 2017 USD ($)	Feb. 03, 2018 USD ($)	Jul. 31, 2015 USD ($)
Debt Instrument [Line Items]
Amortization of debt discount						$ 29,669,000	$ 22,685,000
Total cost of convertible note hedge transactions						91,857,000
Cash proceeds from sale of warrants						51,021,000
Convertible Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
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			85,295,000		85,295,000
Third party offering costs	$ 4,600,000
Amortization of debt issuance costs				200,000		300,000
Amortization of debt discount				3,900,000		$ 5,700,000
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		$ 22,300,000
Deferred tax asset				$ 22,500,000		$ 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		$ 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		$ 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		31,448,000		31,448,000		44,135,000
Third party offering costs		$ 2,300,000
Amortization of debt issuance costs				300,000	$ 300,000	800,000	800,000
Amortization of debt discount				4,300,000	4,000,000	$ 12,700,000	11,900,000
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		$ 32,800,000
Deferred tax asset				$ 26,600,000		$ 26,600,000
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		$ 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		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	9,701,000		$ 9,701,000		$ 20,988,000
Third party offering costs			$ 1,000,000
Amortization of debt issuance costs				200,000	200,000	700,000	600,000
Amortization of debt discount				3,800,000	$ 3,600,000	$ 11,300,000	$ 10,800,000
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		$ 27,500,000
Deferred tax asset				$ 28,600,000		$ 28,600,000
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		$ 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