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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]      
Net income $ 160,316 $ 157,364 $ 151,505
Other comprehensive income (loss) net of tax:      
Net unrealized gains (losses) on available-for-sale securities (27,536) 22,924 (10,953)
Reclassification adjustment of net gains from sale of available-for-sale securities included in net income 9,641 0 0
Related tax benefit (expense) 6,577 (8,425) 4,025
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent (11,318) 14,499 (6,928)
Net unrealized gain (loss) on long-term borrowing hedge (14,287) (268) 0
Related tax benefit (expense) 5,250 99 0
Derivatives qualifying as hedges, net of tax, portion attributable to parent (9,037) (169) 0
Other comprehensive income (loss) (20,355) 14,330 (6,928)
Comprehensive income $ 139,961 $ 171,694 $ 144,577