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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net income $ 35,163 $ 30,121 $ 102,651 $ 80,475
Other comprehensive income (loss) net of tax:        
Net unrealized gain (loss) on available-for-sale securities, net of quarter-to-date tax of $1,422 and $14,154, and year-to-date tax of $13,394 and $4,498, respectively (2,447) 24,360 (23,053) (12,895)
Reclassification adjustment of net gain from sale of available-for-sale securities included in net income 0 0 0 5,153
Other comprehensive income (loss) (2,447) 24,360 (23,053) (7,742)
Comprehensive income $ 32,716 $ 54,481 $ 79,598 $ 72,733