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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 56,281 $ 45,721 $ 291,560 $ 266,104
Other comprehensive income (loss), net of tax        
Net unrealized holding gains (losses) on available-for-sale securities, net of tax (191) 377 (296) 2,519
Amortization and unrealized gains (losses) on interest rate agreements, net of tax 54,475 (23,440) (29,981) (36,545)
Net unrealized gains (losses) on commodity cash flow hedges, net of tax 11,563 (2,471) (19,571) 6,448
Total other comprehensive income (loss) 65,847 (25,534) (49,848) (27,578)
Total comprehensive income (loss) $ 122,128 $ 20,187 $ 241,712 $ 238,526