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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No definition available.

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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
	Apr. 30, 2019	Apr. 30, 2018	Jan. 31, 2019	Jun. 30, 2013
Convertible Debt [Abstract]
Convertible Debt, Current	$ 235,408,000		$ 232,514,000
Convertible Debt, Noncurrent	983,507,000		972,264,000
2018 Notes
Convertible Debt [Abstract]
Principal				$ 350,000,000
Equity issuance costs		$ 2,000,000
2020 Notes
Convertible Debt [Abstract]
Principal	249,975,000		249,975,000	$ 250,000,000
Unamortized debt discount	(13,755,000)		(16,480,000)
Unamortized debt issuance costs	(812,000)		(981,000)
Convertible Debt, Current	235,408,000		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
Unamortized debt discount	(156,720,000)		(167,249,000)
Unamortized debt issuance costs	(9,773,000)		(10,487,000)
Convertible Debt, Noncurrent	983,507,000		972,264,000
Carrying amount of the equity component	$ 219,702,000		$ 219,702,000