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Debt and Financing Arrangements - Additional Information (Details) $ / shares in Units, shares in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Jun. 25, 2020 USD ($) day $ / shares shares | Apr. 30, 2021 USD ($) | Apr. 30, 2020 USD ($) | Jan. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |
Net proceeds from debt offering, after deducting initial purchaser discounts and debt issuance costs paid or payable | $ 278,200,000 |  |  |
Conversion rate | 0.0249507 |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 40.08 |  |  |
Carrying amount of equity component representing conversion option | $ 70,800,000 |  |  | $ 70,768,000
Issuance costs attributable to equity component |  |  |  | 2,290,000
Net cost incurred to purchase Capped Calls | $ 35,700,000 |  |  |
Capped Calls |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial strike price (in dollars per share) | $ / shares | $ 40.08 |  |  |
Cap price (in dollars per share) | $ / shares | $ 61.66 |  |  |
Number of shares of common stock covered by capped calls (in shares) | shares | 7.2 |  |  |
Automatic exercise period for capped calls, trading days | day | 40 |  |  |
Debt Conversion Terms, One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold trading days | day | 20 |  |  |
Threshold consecutive trading days | day | 30 |  |  |
Threshold percentage of stock price trigger | 130.00% |  |  |
Debt Conversion Terms, Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold trading days | day | 5 |  |  |
Threshold consecutive trading days | day | 10 |  |  |
Threshold percentage of product of last reported sales price of common stock and conversion rate on each such trading day | 98.00% |  |  |
On or after July 6, 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold trading days | day | 20 |  |  |
Threshold consecutive trading days | day | 30 |  |  |
Threshold percentage of stock price trigger | 130.00% |  |  |
Convertible Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount of debt issued | $ 287,500,000 | $ 287,500,000 |  |
Stated interest rate | 1.25% |  |  |
Event of default, option to accelerate amounts due, minimum percentage of aggregate principal amount of outstanding debt | 25.00% |  |  |
Effective interest rate | 7.88% | 1.93% |  |
Issuance costs attributable to company |  |  |  | 9,300,000
Issuance costs attributable to liability component |  |  |  | 7,000,000.0
Long-term debt |  | $ 279,703,000 |  | 217,528,000
Unamortized issuance costs |  | 7,797,000 |  | $ 6,308,000
Interest expense related to the Notes |  | $ 1,317,000 | $ 0 |
Convertible Senior Notes | Discount Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Liability component calculation, measurement input | 0.0730 |  |  |
Convertible Senior Notes | On or after July 6, 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption, threshold trading days immediately preceding maturity date | day | 41 |  |  |
Redemption price, percentage of principal amount to be redeemed | 100.00% |  |  |
Convertible Senior Notes | Fundamental Change |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price, percentage of principal amount to be redeemed | 100.00% |  |  |

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