Income Taxes Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax at statutory rate of 35%	$ 130,655	$ 101,648	$ 103,743
Common stock dividends deductible for tax reporting	(2,153)	(2,096)	(1,930)
Penalties	153	66	2,292
Recognition (settlement) of uncertain tax positions	1,341	1,831	(4,950)
State taxes (net of federal benefit)	10,687	(5,958)	8,109
Other, net	1,916	2,735	(445)
Income tax expense (benefit)	$ 142,599	$ 98,226	$ 106,819