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Debt - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2021 | Sep. 30, 2018 | Jan. 31, 2024 | Oct. 31, 2023 | Jul. 31, 2024 | Jul. 31, 2023 | May 31, 2023
Convertible Senior Notes Due 2023 | Convertible Debt |  |  |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |  |  |
Principal on face amount of debt |  | $ 575,000,000.0 |  |  |  |  |
Debt interest rate percentage |  | 0.50% |  |  |  |  |
Proceeds from issuance of debt |  | $ 560,800,000 |  |  |  |  |
Repayments of convertible senior notes |  |  |  | $ 37,100,000 |  |  |
Debt instrument, effective interest rate |  |  |  |  | 1.00% |  |
Convertible Senior Notes Due 2023 | Convertible Debt | Capped Calls |  |  |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |  |  |
Settlement of capped calls, net of related costs |  |  |  |  |  | $ 23,700,000 |
Convertible Senior Notes Due 2024 | Convertible Debt |  |  |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |  |  |
Principal on face amount of debt | $ 690,000,000.0 |  |  |  |  |  |
Debt interest rate percentage | 0.00% |  |  |  |  |  |
Proceeds from issuance of debt | $ 677,300,000 |  |  |  |  |  |
Repayments of convertible senior notes |  |  | $ 689,900,000 |  |  |  |
Debt instrument, effective interest rate |  |  |  |  | 0.60% |  |
Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity |  |  |  |  |  |  | $ 500,000,000.0
Line of credit, additional borrowing amount |  |  |  |  |  |  | $ 250,000,000.0
Carrying value of debt |  |  |  |  | $ 0 |  |
Credit Facility | Revolving Credit Facility | Minimum |  |  |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |  |  |
Line of credit, commitment fee percentage on undrawn balance |  |  |  |  | 0.25% |  |
Credit Facility | Revolving Credit Facility | Maximum |  |  |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |  |  |
Line of credit, commitment fee percentage on undrawn balance |  |  |  |  | 0.30% |  |

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