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Convertible Senior Notes - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended |
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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

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