Income Taxes Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation Abstract
Tax at statutory rate of 35%	$ 101,648	$ 103,743	$ 108,169
Common stock dividends deductible for tax reporting	2,096	1,930	1,785
State taxes (net of federal benefit)	(5,958)	8,109	11,493
Settlement of uncertain tax positions	1,831	(4,950)	0
Penalties	66	2,292	104
Other, net	2,735	(445)	1,222
Income tax expense (benefit)	$ 98,226	$ 106,819	$ 119,203

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible expenses under enacted tax laws, or differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles, not otherwise listed in the existing taxonomy.

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to state and local income tax expense or benefit.

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