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Debt
 9 Months Ended
Oct. 31, 2023
Debt Disclosure [Abstract]  
Debt Debt
Convertible Senior Notes

In September 2018, we issued $575.0 million in aggregate principal amount of the 0.5% Convertible Senior Notes due in 2023 (“2023 Notes”). The net proceeds from the issuance of the 2023 Notes were $560.8 million after deducting the initial purchasers’ discounts and transaction costs. Based upon the reported sales price of our common stock, the 2023 Notes became convertible on August 1, 2020 and were convertible through July 31, 2022. Subsequently, the 2023 Notes became convertible at the option of the holders at any time on or after June 15, 2023, until the close of business on September 13, 2023. We have not received conversion notices on our 2023 Notes in the nine months ending October 31, 2023.

We repaid in cash $37.1 million in aggregate principal amount of the 2023 Notes on their maturity date, September 15, 2023.

In January 2021, we issued $690.0 million in aggregate principal amount of the 0% Convertible Senior Notes due in 2024 (“2024 Notes,” and together with the 2023 Notes, the “Notes”). The net proceeds from the issuance of the 2024 Notes were $677.3 million after deducting the initial purchasers’ discounts and transaction costs. The 2024 Notes became convertible at the option of the holders at any time on or after October 15, 2023 and will remain convertible until the close of business on January 11, 2024. As a result, the 2024 Notes were convertible as of October 31, 2023. We have not received conversion notices on our 2024 Notes in the nine months ending October 31, 2023.
Net Carrying Amounts of the Liability Components

As of January 31, 2023, the 2023 Notes were within one year of maturity and were therefore classified as current liabilities in our consolidated balance sheets. The 2023 Notes matured September 15, 2023. As of October 31, 2023 and January 31, 2023, the 2024 Notes are within one year of maturity and are therefore classified as current liabilities in our consolidated balance sheets. The 2024 Notes mature January 15, 2024. The net carrying amounts of the Notes were as follows:
(in thousands)October 31, 2023January 31, 2023
2023 Notes:
Principal$— $37,083 
Less: unamortized transaction costs— (118)
Net carrying value of liability component$— $36,965 
2024 Notes:
Principal$690,000 $690,000 
Less: unamortized transaction costs(889)(4,078)
Net carrying value of liability component$689,111 $685,922 

The effective interest rate on the 2023 Notes was 1.0%. The effective interest rate on the 2024 Notes was 0.6%. Interest expense recognized related to the Notes was as follows:
Three Months Ended October 31,Nine Months Ended October 31,
(in thousands)2023202220232022
Contractual interest expense$22 $46 $425 $139 
Amortization of transaction costs1,089 1,105 3,308 3,309 
Total$1,111 $1,151 $3,733 $3,448 

Capped Calls

To minimize the potential economic dilution to our common stock upon conversion of the Notes, we entered into privately-negotiated capped call transactions (“Capped Calls”) with certain counterparties.

The material terms of the capped call transactions were as follows:
(in thousands, except per share amounts)2024 Notes
Aggregate cost of capped calls$31,395 
Initial strike price per share (1)
$420.24 
Initial cap price per share (1)
$525.30 
Shares of our common stock covered by the capped calls (1)
1,642 
(1) Subject to adjustments for certain events, such as merger events and tender offers, and anti-dilution adjustments

In the first quarter of fiscal 2024, we unwound $23.7 million of the Capped Calls in relation to our 2023 Notes and received cash from the counterparties. During three months ended October 31, 2023, the remaining associated Capped Calls expired.

Impact on Net Income (Loss) Per Share

In periods when we have net income, the shares of our common stock subject to the Notes outstanding during the period are included in our diluted earnings per share under the if-converted method. Capped Calls are excluded from the calculation of diluted earnings per share, as they would be antidilutive.

Upon conversion, there will be no economic dilution from the Notes unless the market price of our common stock exceeds the cap prices listed above in the Capped Calls section, as exercise of the Capped Calls offsets any dilution from the Notes from the conversion price up to the cap price. As of October 31, 2023, the market price of our common stock did not exceed the $525.30 cap price associated with the 2024 Notes; therefore, the Notes would not have caused economic dilution if converted.
Revolving Credit Facility

In January 2021, we entered into a credit agreement, as subsequently amended in May 2023, with a syndicate of banks. The credit agreement extended a senior secured revolving credit facility (the “Credit Facility”) to us in an aggregate principal amount of $500.0 million, which amount may be increased by an additional $250.0 million subject to the terms of the credit agreement. We may use the proceeds of future borrowings under the credit facility to finance working capital, for capital expenditures and for other general corporate purposes, including permitted acquisitions.
The Credit Facility matures in January 2026 and requires us to comply with customary affirmative and negative covenants. We were in compliance with all covenants as of October 31, 2023. As of October 31, 2023, there were no outstanding borrowings under the Credit Facility. The Credit Facility is subject to customary fees for loan facilities of this type, including ongoing commitment fees at a rate between 0.25% and 0.30% per annum on the daily undrawn balance