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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 140,266 | $ 114,702 | $ 263,965 | $ 149,631
Other comprehensive (loss) income, net of tax |  |  |  |
Unrealized (loss) gain on available for sale securities, net of tax of $7,366, $(670), $8,217 and $(4,456), respectively | (20,401) | 1,408 | (22,691) | 6,923
Reclassifications of losses to net income on available for sale securities, net of tax of $(3,036), $0, $(858) and $0, respectively | 14,801 | 0 | 11,647 | 0
Adjustment to postemployment benefit obligation, net of tax of $(104), $(217), $(240) and $(434), respectively | 272 | 318 | 512 | 635
Other comprehensive (loss) income | (5,328) | 1,726 | (10,532) | 7,558
Comprehensive income | $ 134,938 | $ 116,428 | $ 253,433 | $ 157,189

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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