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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 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 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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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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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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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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

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The number of derivative instruments of a particular group held by the entity.

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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 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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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)	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) d Derivative $ / shares $ / Derivative shares	Jun. 30, 2014 USD ($) d Derivative $ / shares $ / Derivative shares	Jul. 29, 2017 USD ($)	Jul. 30, 2016 USD ($)	Jul. 29, 2017 USD ($)	Jul. 30, 2016 USD ($)	Jan. 28, 2017 USD ($)	Jul. 31, 2015 USD ($)
Debt Instrument [Line Items]
Amortization of debt discount					$ 15,018,000	$ 14,213,000
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		52,258,000		52,258,000		60,124,000
Third party offering costs	$ 2,300,000
Amortization of debt issuance costs			300,000	$ 300,000	500,000	500,000
Amortization of debt discount			4,000,000	3,700,000	$ 7,900,000	7,400,000
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	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		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	28,304,000		$ 28,304,000		$ 35,457,000
Third party offering costs		$ 1,000,000
Amortization of debt issuance costs			200,000	200,000	400,000	400,000
Amortization of debt discount			3,600,000	$ 3,400,000	$ 7,200,000	$ 6,800,000
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		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