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Debt (Tables) | 9 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Interest Rate Contracts | The following table presents information related to interest rate contracts entered into by the Company and designated as cash flow hedges:
|  | June 30, 2018 |  | September 30, 2017
Pay fixed swaps - notional amount |  | $ | 350,000 |  |  | $ | 414,063 |
Net unrealized gain |  | $ | 10,863 |  |  | $ | 3,959 |
Weighted-average maturity period (years) |  | 2.9 |  |  | 3.3 |
Weighted-average received rate |  | 2.09 | % |  | 1.23 | %
Weighted-average pay rate |  | 1.36 | % |  | 1.34 | %
Interest Rate Swap Contracts as Reflected on Balance Sheet | At June 30, 2018 and September 30, 2017, the interest rate swap contracts were reflected in the Consolidated Balance Sheets as follows:
Derivatives |  | June 30, 2018 |  | September 30, 2017
Current assets: |  |  |  |
Other current assets |  | $ | 3,489 |  |  | $ | 1,098 |
Long-term assets: |  |  |  |  |  |
Other assets |  | 7,374 |  |  | 2,892 |
Current liabilities: |  |  |  |  |  |
Other current liabilities |  | — |  |  | (7 | )
Long-term liabilities: |  |  |  |  |  |
Other liabilities |  | — |  |  | (24 | )
Total derivatives |  | $ | 10,863 |  |  | $ | 3,959 |
Gain (Loss) on Derivatives | The gains recognized on derivatives were as follows:
| Derivatives in Cash Flow Hedging Relationships |  | Location of Gain Recognized in Income on Derivative |  | Amount of Gain Recognized in Income on Derivatives |  | Amount of Gain Recognized in Income on Derivatives
|  |  |  |  | Three Months Ended June 30, |  | Nine Months Ended June 30,
|  |  |  |  | 2018 |  | 2017 |  | 2018 |  | 2017
| Interest rate swaps |  | Interest expense |  | $ | 490 |  |  | $ | 306 |  |  | $ | 755 |  |  | $ | 1,616 |
The Company recognized the following gains in AOCI:
Derivatives in Cash Flow Hedging Relationships |  | Amount of Gain Recognized in AOCI on Derivatives |  | Location of Gain Reclassified From AOCI into Income (Effective Portion*) |  | Amount of Gain Reclassified from AOCI into Income (Effective Portion*)
|  | June 30, 2018 |  | June 30, 2017 |  |  |  | June 30, 2018 |  | June 30, 2017
Interest rate swaps |  | $ | 5,286 |  |  | $ | 6,712 |  |  | Interest expense |  | $ | 570 |  |  | $ | 986 |
*There is no ineffective portion or amount excluded from effectiveness testing.

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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