Debt - Schedule of Net Carrying Amounts of Liability Component of Convertible Notes (Details) - Convertible Senior Notes - USD ($)	Jul. 31, 2025	Jan. 31, 2025	Sep. 30, 2024	Jan. 31, 2021
1.50% Convertible Senior Notes Due September 15, 2029
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 460,000,000	$ 460,000,000	$ 460,000,000
Unamortized issuance costs	(10,178,000)	(11,362,000)
Net carrying amount	449,822,000	448,638,000
0.00% Convertible Senior Notes Due January 15, 2026
Debt Instrument [Line Items]
Debt instrument, principal amount	205,000,000	205,000,000		$ 345,000,000
Unamortized issuance costs	(524,000)	(1,093,000)
Net carrying amount	$ 204,476,000	$ 203,907,000