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Long-Term Debt, Net - Schedule of Interest Expense for Notes (Detail) - Convertible Senior Notes Due 2025 - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 31, 2020	Oct. 31, 2020
Debt Instrument [Line Items]
Cash interest expense	$ 3,848	$ 7,966
Amortization of discount	4,113	8,308
Total interest expense	$ 7,961	$ 16,274

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

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