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Convertible Senior Notes - Schedule of Interest Expense for the Notes (Details) - Convertible Debt - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Debt Instrument [Line Items]
Contractual interest expense	$ 563	$ 0	$ 763	$ 0
Amortization of debt discount	2,938	0	3,971	0
Amortization of issuance costs	174	0	234	0
Total	$ 3,675	$ 0	$ 4,968	$ 0

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- 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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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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