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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Dec. 31, 2021
Accumulated Other Comprehensive Loss. |
Schedule of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive loss are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | September 30,
​ |  | 2021 |  | 2021
​ | ​ | (Amounts in thousands)
Cumulative effect of foreign currency translation, net | ​ | $ | (4,021) | ​ | $ | (4,050)
Cumulative unrealized loss on pension liability | ​ |  | (5,398) | ​ |  | (5,398)
Accumulated other comprehensive loss, net | ​ | $ | (9,419) | ​ | $ | (9,448)

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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