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Stockholders' Equity | 12 Months Ended
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Sep. 30, 2022
Equity [Abstract] |
Stockholders' Equity | 13. Stockholders’ Equity Preferred Stock Total number of shares of preferred stock authorized for issuance was 1,000,000 shares at September 30, 2022 and 2021, respectively. Preferred stock has a par value of $0.01 per share and may be issued at the discretion of the Board of Directors without stockholder approval with such designations, rights and preferences as the Board of Directors may determine. There were no shares of preferred stock issued or outstanding at September 30, 2022 or 2021, respectively. Accumulated Other Comprehensive Income The following is a summary of the components of accumulated other comprehensive income, net of tax, at September 30, 2022, 2021 and 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | Gains (Losses) | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Currency | ​ | on Available- | ​ | Gain on | ​ | Pension | ​ |  | ​
​ | ​ | Translation | ​ | for-Sale | ​ | Derivative asset | ​ | Liability | ​ |  | ​
​ | ​ | Adjustments | ​ | Securities | ​ | Net of tax | ​ | Adjustments | ​ | Total
Balance at September 30, 2019 | ​ | $ | 4,184 | ​ |  | (8) | ​ |  | — | ​ |  | (665) | ​ |  | 3,511
Other comprehensive income (loss) before reclassifications | ​ |  | 18,877 | ​ |  | 5 | ​ |  | — | ​ |  | (503) | ​ |  | 18,379
Amounts reclassified from accumulated other comprehensive income | ​ |  | — | ​ |  | 2 | ​ |  | — | ​ |  | 27 | ​ |  | 29
Balance at September 30, 2020 | ​ |  | 23,061 | ​ |  | (1) | ​ |  | — | ​ |  | (1,141) | ​ |  | 21,919
Other comprehensive income (loss) before reclassifications | ​ |  | (2,922) | ​ |  | — | ​ |  | — | ​ |  | 333 | ​ |  | (2,589)
Amounts reclassified from accumulated other comprehensive income | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 21 | ​ |  | 21
Balance at September 30, 2021 | ​ |  | 20,139 | ​ | ​ | (1) | ​ | $ | — | ​ | ​ | (787) | ​ |  | 19,351
Other comprehensive income (loss) before reclassifications | ​ |  | (169,266) | ​ |  | (10,908) | ​ |  | 93,020 | ​ |  | 412 | ​ |  | (86,742)
Amounts reclassified from accumulated other comprehensive income | ​ |  | (16,567) | ​ |  | — | ​ |  | — | ​ |  | 42 | ​ |  | (16,525)
Balance at September 30, 2022 | ​ | $ | (165,694) | ​ | $ | (10,909) | ​ | $ | 93,020 | ​ | $ | (333) | ​ | $ | (83,916)
​ ​ Unrealized net holding gains (losses) on available-for-sale marketable securities are reclassified from accumulated other comprehensive income into results of operations at the time of the securities’ sale, as described in Note 5, “Marketable Securities.” Gains (losses) related to defined benefit pension plan settlements are reclassified from accumulated other comprehensive income into results of operations at the time of the settlement. Defined benefit pension plan curtailments are recognized as reclassifications from accumulated other comprehensive income and corresponding reductions in pension liabilities and net pension cost.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI https://asc.fasb.org/topic&trid=2208762 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 16 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496180-112644 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126731327&loc=SL126733271-114008 + Details
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