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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (PARENTHETICALS) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Other Comprehensive Income Loss Tax Portion Attributable To Parent Abstract    
Unrealized holding gains (losses) on available-for-sale securities tax $ (220) $ 514
Amortization and unrealized gains (losses) on interest rate agreements tax 7,049 (638)
Net unrealized gains (losses) on cash flow hedging transactions tax $ (233) $ (10,597)