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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Derivatives |  |  |
Interest expense | $ (26,371) | $ (24,344) | $ (20,610)
Income before income tax | 96,287 | 95,234 | 89,652
Income taxes | (22,354) | (29,073) | (26,364)
Net income | 73,933 | 66,161 | 63,288
Prior service (cost) credit |  |  |
Postretirement benefit plans |  |  |
Income before income tax | 376 | 378 | 375
Actuarial losses |  |  |
Postretirement benefit plans |  |  |
Income before income tax | (10,034) | (7,468) | (6,203)
Postretirement Benefit Plans |  |  |
Postretirement benefit plans |  |  |
Income before income tax | (9,658) | (7,090) | (5,828)
Income taxes | (3,767) | (2,765) | (2,273)
Net income | (5,891) | (4,325) | (3,555)
Derivatives |  |  |
Postretirement benefit plans |  |  |
Net income | 1,069 | (1,919) | (2,392)
Derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Derivatives |  |  |
Interest expense | 1,752 | (3,146) | (3,922)
Income before income tax | 1,752 | (3,146) | (3,922)
Income taxes | (683) | 1,227 | 1,530
Net income | $ 1,069 | $ (1,919) | $ (2,392)

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: 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.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: 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.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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