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Debt
 6 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Debt
NOTE 8: DEBT
The Company adopted ASU 2020-06 on October 1, 2021. See Note 1: Organization And Summary Of Significant Accounting Policies for further discussion of this recently adopted accounting policy.
The following table presents the Company's debt instruments outstanding:
 March 31, 2022March 31, 2021
September 30, 2021
(in thousands)Gross AmountDebt Issuance CostsCarrying AmountGross AmountDebt Discount and Issuance CostsCarrying AmountGross AmountDebt Discount and Issuance CostsCarrying Amount
2024 Convertible Notes$143,750 $(1,502)$142,248 $143,750 $(23,443)$120,307 $143,750 $(20,207)$123,543 
2025 Convertible Notes172,500 (2,580)169,920 172,500 (35,664)136,836 172,500 (31,857)140,643 
Total long-term debt$316,250 $(4,082)$312,168 $316,250 $(59,107)$257,143 $316,250 $(52,064)$264,186 
The following table presents the Company's contractual maturities related to the debt instruments as of March 31, 2022:
 Schedule of Contractual Maturities
(in thousands)TotalLess Than 1 Year1 - 3 Years3 - 5 YearsMore Than 5 Years
2024 Convertible Notes$143,750 $— $143,750 $— $— 
2025 Convertible Notes172,500 — — 172,500 — 
$316,250 $— $143,750 $172,500 $— 
The following table presents the Company's interest expense related to the Convertible Notes for the three and six months ended March 31, 2022 and 2021:
Three Months Ended
March 31,
Six Months Ended
March 31,
(in thousands)2022202120222021
2024 Convertible Notes:
Contractual interest expense$1,033 $1,033 $2,066 $2,066 
Amortization of deferred financing costs142 111 309 223 
Amortization of debt discount— 1,461 — 2,891 
Total interest expense$1,175 $2,605 $2,375 $5,180 
2025 Convertible Notes:
Contractual interest expense$1,024 $1,024 $2,048 $2,048 
Amortization of deferred financing costs182 141 389 281 
Amortization of debt discount— 1,712 — 3,391 
Total interest expense$1,206 $2,877 $2,437 $5,720 
2.875% Convertible Senior Notes Due 2024
In July 2017, we issued $143.75 million aggregate principal amount of 2.875% Convertible Senior Notes Due 2024 (the “2024 Convertible Notes”). The 2024 Convertible Notes were issued pursuant to an indenture dated July 5, 2017 (the "2017 Indenture") by and between the Company and Wells Fargo Bank, National Association, as the original trustee. Effective October 1, 2019, Truist (formerly BB&T) assumed the duties and responsibilities as trustee under the 2017 Indenture. The 2024 Convertible Notes were issued in a private offering under Rule 144A under the Securities Act of 1933. The 2024 Convertible Notes pay interest semi-annually in arrears at a rate of 2.875% per annum on January 1 and July 1 of each year, commencing January 1, 2018, and mature on July 1, 2024 (the "2024 Maturity Date"), unless converted, redeemed or repurchased in accordance with the terms prior to such date. At maturity, the holders of the 2024 Convertible Notes will be entitled to receive cash equal to the principal of the 2024 Convertible Notes plus accrued interest.
The effective interest rate for the three and six months months ended March 31, 2022 was approximately 3.35%. As of March 31, 2022, the remaining unamortized debt issuance costs will be amortized using the effective interest method through the 2024 Maturity Date assuming no early conversion.
The 2024 Convertible Notes are convertible based on an initial conversion rate of 100 shares of Class A Common Stock per $1,000 principal amount (equivalent to an initial conversion price of $10.00 per share). The conversion rate will not be adjusted for any accrued and unpaid interest. The 2024 Convertible Notes contain certain make-whole fundamental change premiums and customary anti-dilution adjustments. Upon conversion, we may settle in cash, shares of Class A Common Stock or any combination thereof, at our election.
Prior to January 1, 2024, the 2024 Convertible Notes will be convertible only under the following circumstances: (1) during any fiscal quarter commencing after the fiscal quarter ending on September 30, 2017 (and only during such fiscal quarter), if the last reported sale price of our Class A Common Stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price, as defined in the 2017 Indenture, per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our Class A Common Stock and the conversion rate on such trading day; (3) if we call any or all of the 2024 Convertible Notes for redemption, at any time prior to the close of business on the business day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events, as defined in the 2017 Indenture. On or after January 1, 2024 until the close of business on the business day immediately preceding the 2024 Maturity Date, holders of 2024 Convertible Notes may, at their option, convert their 2024 Convertible Notes at any time, regardless of the foregoing circumstances.
At our option, we may redeem for cash all or any portion of the 2024 Convertible Notes on or after July 6, 2021, if the last reported sale price of the Class A Common Stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive), including the trading day immediately preceding the date on which we provide notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which we provide notice of redemption. The redemption price will be equal to 100% of the principal amount of the 2024 Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date.
The stock trading price condition and other triggers are measured on a quarter-by-quarter basis and were not met as of March 31, 2022. As of March 31, 2022, the if-converted value of the 2024 Convertible Notes did not exceed the principal amount.
2.375% 2025 Convertible Senior Notes Due 2025
In May 2018, we issued $172.5 million aggregate principal amount of 2.375% Convertible Senior Notes Due 2025 (the “2025 Convertible Notes”). The 2025 Convertible Notes were issued pursuant to an indenture dated May 14, 2018 (the "2018 Indenture") by and between the Company and Wells Fargo Bank, National Association, as the original trustee. Effective October 1, 2019, Truist (formerly BB&T) assumed the duties and responsibilities as trustee under the 2018 Indenture. The 2025 Convertible Notes were issued in a private offering under Rule 144A under the Securities Act of 1933. The 2025 Convertible Notes pay interest semi-annually in arrears at a rate of 2.375% per annum on May 1 and November 1 of each year, commencing November 1, 2018, and mature on May 1, 2025 (the "2025 Maturity Date"), unless converted, redeemed or repurchased in accordance with the terms prior to such date.

The effective interest rate for the three and six months months ended March 31, 2022 was approximately 2.88% for the 2025 Convertible Notes. As of March 31, 2022, the remaining unamortized debt issuance costs will be amortized using the effective interest method through the 2025 Maturity Date assuming no early conversion.

The 2025 Convertible Notes are convertible based on an initial conversion rate of 62.8931 shares of Class A Common Stock per $1,000 principal amount (equivalent to an initial conversion price of $15.90 per share). The conversion rate will not be adjusted for any accrued and unpaid interest. The 2025 Convertible Notes contain certain make-whole fundamental change premiums and customary anti-dilution adjustments. Upon conversion, we may settle in cash, shares of Class A Common Stock or any combination thereof, at our election.

Prior to November 1, 2024, the 2025 Convertible Notes are convertible only under the following circumstances: (1) during any fiscal quarter commencing after the fiscal quarter ended on June 30, 2018 (and only during such fiscal quarter), if the last reported sale price of our Class A Common Stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price, as defined in the 2018 Indenture, per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our Class A Common Stock and the conversion rate on such trading day; (3) if we call any or all of the 2025 Convertible Notes for redemption, at any time prior to the close of business on the business day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events, as defined in the 2018 Indenture. On or after November 1, 2024 until the close of business on the business day immediately preceding the 2025 Maturity Date, holders of 2025 Convertible Notes may, at their option, convert their 2025 Convertible Notes at any time, regardless of the foregoing circumstances.

We may not redeem the 2025 Convertible Notes prior to May 1, 2022. At our option, we may redeem for cash all or any portion of the 2025 Convertible Notes on or after May 1, 2022, if the last reported sale price of the Class A Common Stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive), including the trading day immediately preceding the date on which we provide notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which we provide notice of redemption. The redemption price will be equal to 100% of the principal amount of the 2025 Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date.
The stock trading price condition and other triggers are measured on a quarter-by-quarter basis and were not met as of March 31, 2022. As of March 31, 2022, the if-converted value of the 2025 Convertible Notes did not exceed the principal amount.