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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		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
2018 Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 0	$ 656	$ 1,196	$ 1,969
Interest cost related to amortization of debt issuance costs	0	352	641	1,056
Interest cost related to amortization of the debt discount	0	4,162	7,850	12,310
2020 Notes
Debt Instrument [Line Items]
Contractual interest expense	937	938	2,812	2,813
Interest cost related to amortization of debt issuance costs	167	168	504	503
Interest cost related to amortization of the debt discount	2,643	2,482	7,805	7,332
2022 Notes
Debt Instrument [Line Items]
Contractual interest expense	718	367	2,156	367
Interest cost related to amortization of debt issuance costs	714	365	2,143	365
Interest cost related to amortization of the debt discount	$ 10,293	$ 5,042	$ 30,529	$ 5,042

X

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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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