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CONVERTIBLE SENIOR NOTES AND CAPPED CALLS | 9 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
CONVERTIBLE SENIOR NOTES AND CAPPED CALLS | CONVERTIBLE SENIOR NOTES AND CAPPED CALLS Convertible Senior Notes In February 2019, the Company issued $287.5 million aggregate principal amount of 0.50% convertible senior notes (the "Initial Notes") due 2024 in a private placement, including the exercise in full of the initial purchasers' option to purchase additional notes. The total net proceeds from the debt offering, after deducting initial purchase discounts, debt issuance costs, and costs of the capped call transactions described below, were approximately $245.8 million. In November 2019, the Company issued an additional $75.0 million aggregate principal amount of 0.50% convertible senior notes (the "2019 Notes") due 2024 in a registered offering under the same indenture as the Initial Notes. The total net proceeds from the 2019 Notes, after deducting underwriting discounts, debt issuance costs and costs of the capped call transactions described below, were approximately $64.6 million. In December 2021, the Company issued an additional $137.5 million aggregate principal amount of its currently outstanding 0.50% convertible senior notes (the "Additional Notes" and together with the Initial Notes and 2019 Notes, the "Notes") due 2024 in a private placement under the same indenture as the Initial Notes. The total net proceeds from the Additional Notes, after deducting initial purchase discounts and debt issuance costs, were approximately $134.3 million. The Company did not enter into any capped calls in connection with this transaction. The Additional Notes constitute a further issuance of, and form a single series with, the Initial Notes. Immediately after giving effect to the issuance of the Additional Notes, the Company had $500.0 million aggregate principal amount of convertible senior notes. The Notes are senior unsecured obligations of the Company and interest is payable semiannually in arrears on February 1 and August 1 of each year, beginning on August 1, 2019. The Notes will mature on February 1, 2024, unless earlier repurchased, redeemed, or converted. Each $1,000 principal amount of the Notes is initially convertible into 38.9484 shares of the Company’s common stock, par value $0.001, which is equivalent to an initial conversion price of approximately $25.68 per share. The conversion rate is subject to adjustment upon the occurrence of certain specified events but will not be adjusted for any accrued and unpaid interest. In addition, upon the occurrence of certain corporate events that occur prior to the maturity date or following the Company's issuance of a notice of redemption, in each case as described in the Indenture, the Company will, in certain circumstances, increase the conversion rate for a holder that elects to convert its Notes in connection with such a corporate event or during the relevant redemption period. Prior to the close of business on the business day immediately preceding October 1, 2023, the Notes will be convertible only under the following circumstances: 1.At any time during any calendar quarter commencing after the fiscal quarter ending on June 30, 2019 (and only during such calendar quarter), if the last reported sale price of the Common Stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; 2.During the five business day period immediately after any ten consecutive trading day period (the measurement period), if the trading price per $1,000 principal amount of the Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the common stock on each such trading day and the conversion rate on each such trading day; 3.If the Company calls any or all of the Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or 4.Upon the occurrence of specified corporate events (as set forth in the indenture governing the Notes). On or after October 1, 2023, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their Notes, regardless of the foregoing circumstances. Upon conversion, the Company will satisfy its conversion obligation by paying or delivering, as the case may be, cash, shares of common stock, or a combination of cash and shares of common stock, at the Company's election. The Company’s current intent is to settle the principal amount of the Notes in cash upon conversion. During the three months ended December 31, 2021, the conditions allowing holders of the Notes to convert were not met. The Company may not redeem the Notes prior to February 4, 2022. On or after February 4, 2022, the Company may redeem for cash all or part of the Notes, at the redemption price equal to 100% of the principal amount thereof, plus accrued and unpaid interest, if the last reported sale price of the common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which the Company provides a redemption notice. If a fundamental change (as defined in the indenture governing the notes) occurs at any time, holders of Notes may require the Company to repurchase for cash all or any portion of their Notes at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. The Notes are senior unsecured obligations and will rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated in right of payment to the Notes; equal in right of payment with the Company’s existing and future liabilities that are not so subordinated; effectively junior in right of payment to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of current or future subsidiaries of the Company. The following table presents the net carrying amount of the liability component of the Notes:
|  | December 31, 2021 |  | March 31, 2021
Principal |  | $ | 500,000 |  |  | $ | 362,500 |
Unamortized debt discount |  | (54,818) |  |  | (53,323) |
Unamortized issuance costs |  | (4,194) |  |  | (742) |
Net carrying amount |  | $ | 440,988 |  |  | $ | 308,435 |
The following table presents interest expense related to the Notes:
|  | Three Months Ended December 31, |  | Nine Months Ended December 31,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Contractual interest expense |  | $ | 486 |  |  | $ | 453 |  |  | $ | 1,359 |  |  | $ | 1,359 |
Amortization of debt discount |  | 4,785 |  |  | 4,198 |  |  | 13,204 |  |  | 12,399 |
Amortization of issuance costs |  | 140 |  |  | 59 |  |  | 185 |  |  | 174 |
Total interest expense |  | $ | 5,411 |  |  | $ | 4,710 |  |  | $ | 14,748 |  |  | $ | 13,932 |
Capped Call In connection to the February 2019 and November 2019 sale of the Notes, the Company entered into privately negotiated capped call transactions ("Capped Calls") with certain counterparties. The Capped Calls each have an initial strike price of approximately $25.68 per share, subject to certain adjustments, which corresponds to the initial conversion price of the Notes. The Capped Calls have initial cap prices of $39.50 per share, subject to certain adjustments. The Capped Calls are expected to partially offset the potential dilution to the Company’s Common Stock upon any conversion of the Notes, with such offset subject to a cap based on the cap price. The Capped Calls cover, subject to anti-dilution adjustments, approximately 14.1 million shares of the Company’s Common Stock. The Capped Calls are subject to adjustment upon the occurrence of specified extraordinary events affecting the Company, including merger events, tender offers, and announcement events. In addition, the Capped Calls are subject to certain specified additional disruption events that may give rise to a termination of the Capped Calls, including nationalization, insolvency or delisting, changes in law, failures to deliver, insolvency filings, and hedging disruptions. For accounting purposes, the Capped Calls are separate transactions, and not part of the terms of the Notes. As these transactions meet certain accounting criteria, the Capped Calls are recorded in stockholders' equity and are not accounted for as derivatives.

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