Percentage of premium on the common stock price to conversion price of convertible debt instruments.

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Debt Instrument Convertible Principal Amount

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Represents the default conditions pertaining to the percentage amount of the aggregate principle amount.

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Represents the in excess amount of due indebtedness, which constitutes debt default conditions.

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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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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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The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

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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 instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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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 the debt instrument was issued, in CCYY-MM-DD format.

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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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Description of a subjective acceleration clause that is a part of the debt instrument. A subjective acceleration clause is a provision in a debt agreement that states that the creditor may accelerate the scheduled maturities of the obligation under conditions that are not objectively determinable (for example, if the debtor fails to maintain satisfactory operations or if a material adverse change occurs).

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Convertible Senior Notes - $350 million 0.00% Convertible Senior Notes due 2024 (Detail)	1 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($) D $ / shares	Jan. 30, 2021 USD ($) $ / shares	Feb. 01, 2020 USD ($)	Feb. 02, 2019 USD ($)
Debt default conditions
Amortization of debt discount		$ 42,372,000	$ 46,245,000	$ 41,868,000
Convertible senior notes due 2024
Debt Instrument
Debt instrument, issuance date	Sep. 30, 2019
Debt instrument, principal amount	$ 350,000,000	$ 350,000,000	350,000,000
Debt instrument, maturity date	Sep. 15, 2024
Debt default conditions
Events of default and acceleration of maturity description	Certain events are also considered “events of default” under the 2024 Notes, which may result in the acceleration of the maturity of the 2024 Notes, as described in the indenture governing the 2024 Notes. Events of default under the indenture for the 2024 Notes include, among other things, the occurrence of an event of default by us as defined under any mortgage, indenture or instrument under which there may be issued, or by which there may be secured or evidenced, any indebtedness of the Company or any of its significant subsidiaries for money borrowed, if that event of default (i) constitutes the failure to pay when due indebtedness in the aggregate principal amount in excess of $20 million and (ii) such event of default continues for a period of 30 days after written notice is delivered to the Company by the Trustee or to the Company and the Trustee by the holders of at least 25% of the aggregate principal amount of the 2024 Notes then outstanding.
Debt Instrument Convertible Terms Of Conversion Feature	The initial conversion rate applicable to the 2024 Notes is 4.7304 shares of common stock per $1,000 principal amount of 2024 Notes, or a total of approximately 1.656 million shares for the total $350 million principal amount. This initial conversion rate is equivalent to an initial conversion price of approximately $211.40 per share, which represents a 25% premium to the $169.12 closing share price on the day the 2024 Notes were priced.
Debt default, failure to pay due indebtedness, threshold amount	$ 20,000,000
Debt default, failure to pay due indebtedness, threshold period	30 days
Percentage of aggregate principal amount of notes outstanding	25.00%
Debt instrument, initial conversion rate	100
Debt instrument, conversion principal amount	$ 1,000
Debt instrument, total conversion rate	1,656,000
Debt instrument, convertible earliest date	Jun. 15, 2024
Conversion price per share \| $ / shares	$ 211.40
Premium on stock trigger price	25.00%
Debt instrument, convertible, stock price trigger \| $ / shares	$ 169.12	$ 169.12
Debt instrument, effective interest rate	5.74%
Third party offering costs	$ 1,300,000
Amortization of debt issuance costs		$ 700,000	200,000
Amortization of debt discount		$ 15,800,000	$ 5,600,000
Convertible senior notes due 2024 \| Common Stock
Debt default conditions
Debt instrument, initial conversion rate	4.7304
Conversion price per share \| $ / shares		$ 211.40
Convertible senior notes due 2024 \| Convertible debt instrument conversion period one
Debt default conditions
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 2024 \| Convertible debt instrument conversion period two
Debt default conditions
Debt instrument, convertible trading days \| D	5
Debt instrument, convertible consecutive trading days \| D	10
Debt instrument, convertible percentage of stock price	98.00%
Private Offering \| Convertible senior notes due 2024
Debt Instrument
Debt instrument, principal amount	$ 350,000,000
Debt instrument, interest rate	0.00%