The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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

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Amount, after accumulated amortization, of debt discount.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Adjustments to additional paid in capital equity component of convertible debt issuance costs.

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Convertible Senior Notes, Net - Schedule of Senior Notes (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jul. 31, 2018	Jul. 31, 2019	Jan. 31, 2019	Sep. 30, 2017	Jun. 30, 2013
Convertible Debt [Abstract]
Convertible Debt, Current		$ 1,233,189,000	$ 232,514,000
Convertible Debt, Noncurrent		0	972,264,000
2018 Notes
Convertible Debt [Abstract]
Principal					$ 350,000,000
Equity issuance costs	$ 2,000,000
2020 Notes
Convertible Debt [Abstract]
Principal		249,948,000	249,975,000		$ 250,000,000
Unamortized debt discount		(10,987,000)	(16,480,000)
Unamortized debt issuance costs		(644,000)	(981,000)
Convertible Debt, Current		238,317,000	232,514,000
Carrying amount of the equity component		66,007,000	66,007,000
Equity issuance costs		2,000,000
2022 Notes
Convertible Debt [Abstract]
Principal		1,150,000,000	1,150,000,000	$ 1,150,000,000
Unamortized debt discount		(146,070,000)	(167,249,000)
Unamortized debt issuance costs		(9,058,000)	(10,487,000)
Convertible Debt, Noncurrent		994,872,000	972,264,000
Carrying amount of the equity component		219,702,000	$ 219,702,000
Equity issuance costs		$ 4,000,000