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Convertible Senior Notes, Net - Schedule of Interest Expense Recognized Related to Convertible Senior Notes (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
2018 Notes
Debt Instrument [Line Items]
Contractual interest expense		$ 540,000		$ 1,196,000
Interest cost related to amortization of debt issuance costs	$ 0	289,000	$ 0	641,000
Interest cost related to amortization of the debt discount		3,567,000		7,850,000
2020 Notes
Debt Instrument [Line Items]
Contractual interest expense	938,000	938,000	1,875,000	1,875,000
Interest cost related to amortization of debt issuance costs	168,000	169,000	337,000	337,000
Interest cost related to amortization of the debt discount	2,768,000	2,601,000	5,493,000	5,162,000
2022 Notes
Debt Instrument [Line Items]
Contractual interest expense	719,000	719,000	1,438,000	1,438,000
Interest cost related to amortization of debt issuance costs	715,000	715,000	1,429,000	1,429,000
Interest cost related to amortization of the debt discount	$ 10,650,000	$ 10,175,000	$ 21,179,000	$ 20,236,000

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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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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