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Debt instrument settlement amount.

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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 noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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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 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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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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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, before jurisdictional netting.

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

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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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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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Convertible Senior Notes - Additional Information (Detail) $ / shares in Units, shares in Millions	1 Months Ended		3 Months Ended
	Jun. 30, 2015 USD ($) d Derivative $ / shares $ / Derivative shares	Jun. 30, 2014 USD ($) d Derivative $ / shares $ / Derivative shares	Apr. 30, 2016 USD ($)	May. 02, 2015 USD ($)	Jan. 30, 2016 USD ($)	Jul. 31, 2015 USD ($)
Debt Instrument [Line Items]
Amortization of debt discount			$ 7,057,000	$ 3,250,000
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		71,456,000		75,113,000
Third party offering costs	$ 2,300,000
Amortization of debt issuance costs			200,000
Amortization of debt discount			$ 3,700,000
Warrants sold to purchase common stock \| shares	5.1
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	510,000
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 5.1 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
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	30 days
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	10 days
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
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	$ 45,889,000		$ 49,289,000
Third party offering costs		$ 1,000,000
Amortization of debt issuance costs			200,000	200,000
Amortization of debt discount			$ 3,400,000	$ 3,300,000
Warrants sold to purchase common stock \| shares		3.0
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
Conversion price per share, two \| $ / shares		$ 171.98
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		30 days
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		10 days
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
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 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
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