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Derivatives and Hedging Activities (Tables) | 6 Months Ended
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Mar. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Interest Rate Swap Contracts Reflected in Consolidated Balance Sheets | At March 31, 2025 and September 30, 2024, derivative instruments were reflected on a gross-basis in the consolidated balance sheets as follows:
Derivatives: |  | March 31, 2025 |  | September 30, 2024
|  | Interest Rate Swaps | Cross-Currency Swaps |  | Interest Rate Swaps | Cross-Currency Swaps
Current assets: |  |  |  |  |  |
Other current assets |  | $ | 190 |  | $ | — |  |  | $ | — |  | $ | — |
Long-term assets: |  |  |  |  |  |
Other non-current assets |  | 380 |  | — |  |  | — |  | — |
Current liabilities: |  |  |  |  |  |
Other current liabilities |  | (511) |  | (32,645) |  |  | (863) |  | (18,042) |
Long-term liabilities: |  |  |  |  |  |
Other non-current liabilities |  | (824) |  | (43,257) |  |  | (1,743) |  | (48,925) |
Total derivatives(1) |  | $ | (765) |  | $ | (75,902) |  |  | $ | (2,606) |  | $ | (66,967) |
(1) Cross-currency swap amounts at March 31, 2025 and September 30, 2024 reflect $73,422 and $58,432 of partial advanced payments received from the counterparties to certain swap contracts, respectively (see below).
Schedule of Interest Rate Contracts | The following table presents information related to interest rate swaps entered into by the Company and designated as cash flow hedges:
|  | March 31, 2025 |  | September 30, 2024
Notional amount |  | $ | 225,000 |  |  | $ | 175,000 |
Weighted-average maturity period (years) |  | 3.2 |  | 3.2
Weighted-average received rate |  | 4.32 | % |  | 4.85 | %
Weighted-average pay rate |  | 3.80 | % |  | 3.83 | %
The following table presents information related to cross currency swaps entered into by the Company and designated as net investment hedges:
|  | Notional Amount |  | Unrealized Gains (Losses) Recognized in AOCI |
Swap Currencies | Maturity Date | March 31, 2025 | September 30, 2024 |  | March 31, 2025 |  | September 30, 2024 |
USD/EUR | September 2027 | $ | 81,392 |  | $ | 81,392 |  |  | $ | (4,019) |  |  | $ | (5,440) |  |
USD/SEK | June 2025 | 20,000 |  | 20,000 |  |  | (137) |  |  | (468) |  |
USD/SGD | August 2026 | 20,000 |  | 20,000 |  |  | 959 |  |  | (441) |  |
USD/EUR | August 2026 | 25,000 |  | 25,000 |  |  | 1,379 |  |  | (30) |  |
USD/CAD | May 2025 | 25,000 |  | — |  |  | (41) |  |  | — |  |
|  | $ | 171,392 |  | $ | 146,392 |  |  | $ | (1,859) |  | (1) | $ | (6,379) |  | (1)
(1) Total unrealized gains (losses) are presented net of tax of $621 and $2,156 as of March 31, 2025 and September 30, 2024, respectively.

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-8 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-5 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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