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Debt - Schedule of Net Carrying Amounts of Liability Component of Notes (Details) - Convertible Senior Notes - USD ($)	Jan. 31, 2025	Sep. 30, 2024	Jan. 31, 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
Unamortized issuance costs	(11,362,000)
Net carrying amount	448,638,000
0.00% Convertible Senior Notes Due January 15, 2026
Debt Instrument [Line Items]
Debt instrument, principal amount	205,000,000		$ 345,000,000	$ 345,000,000
Unamortized issuance costs	(1,093,000)		(3,750,000)
Net carrying amount	$ 203,907,000		$ 341,250,000

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