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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (PARENTHETICALS) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Other Comprehensive Income Loss Tax Portion Attributable To Parent Abstract        
Unrealized holding gains (losses) on available-for-sale securities, tax $ 879 $ (505) $ 403 $ (947)
Interest Rate Contract [Member]        
Schedule of Other Comprehensive Income (Loss), Tax, Cash Flow Hedges [Line Items]        
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax 2,432 (30,819) 54,861 (28,070)
Commodity Contract [Member]        
Schedule of Other Comprehensive Income (Loss), Tax, Cash Flow Hedges [Line Items]        
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax $ 0 $ 140 $ 3,183 $ 1,645