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Organization and Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Mar. 31, 2022
Accounting Policies [Abstract] |
Schedule of Accounting Standards Update and Change in Accounting Principle | We recognized the cumulative effect of initially applying this new standard as of October 1, 2021. We recognized a cumulative effect of initially applying the ASU as an adjustment to the October 1, 2021 opening balance of retained earnings. The conversion option that was previously accounted for in equity under the cash conversion model was recombined into the convertible debt outstanding, and as a result, additional paid in capital and the related unamortized debt discount on the convertible senior notes were reduced. The removal of the remaining debt discounts recorded for this previous separation has the effect of increasing our net debt balance. The prior period consolidated financial statements have not been retrospectively adjusted and continue to be reported under the accounting standards in effect for those periods.
(in thousands) | As Reported September 30, 2021 |  | Adjustments |  | Under ASU 2020-06 October 1, 2021
Principal | $ | 316,250 |  |  | $ | — |  |  | $ | 316,250 |
Unamortized debt discount | (48,785) |  |  | 48,785 |  |  | — |
Deferred financing costs, net | (3,279) |  |  | (1,500) |  |  | (4,779) |
Net carrying amount | 264,186 |  |  | 47,285 |  |  | 311,471 |
Deferred tax asset | 9,746 |  |  | 5,839 |  |  | 15,585 |
Deferred tax liability | 3,684 |  |  | (4,040) |  |  | (356) |
Additional paid-in capital | 403,312 |  |  | (64,263) |  |  | 339,049 |
Retained earnings | 326,781 |  |  | 26,857 |  |  | 353,638 |

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124437754&loc=d3e765-108305 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124437754&loc=d3e725-108305 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794 + Details
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