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Convertible Senior Notes, Net - Schedule of Interest Expense Recognized Related to Convertible Senior Notes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
2018 Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 0	$ 656
Interest cost related to amortization of debt issuance costs	0	352
Interest cost related to amortization of the debt discount	0	4,283
2020 Notes
Debt Instrument [Line Items]
Contractual interest expense	937	937
Interest cost related to amortization of debt issuance costs	169	168
Interest cost related to amortization of the debt discount	2,725	2,561
2022 Notes
Debt Instrument [Line Items]
Contractual interest expense	719	719
Interest cost related to amortization of debt issuance costs	714	700
Interest cost related to amortization of the debt discount	$ 10,529	$ 10,061

X

- Definition

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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