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Summary Of Significant Accounting Policies (Components Of Other Current Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
Summary Of Significant Accounting Policies [Line Items]
Prepayments	$ 3,246	$ 9,489
Prepaid Property and Other Taxes	20,760	13,240
Fair Values of Firm Commitments	14,003	9,096
Other Current Assets	40,354	38,334
Federal [Member]
Summary Of Significant Accounting Policies [Line Items]
Income Taxes Receivable	390	385
State [Member]
Summary Of Significant Accounting Policies [Line Items]
Income Taxes Receivable	$ 1,955	$ 6,124

Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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- Definition

Carrying amount as of the balance sheet date of payments made in advance for income and other taxes, which will be charged against earnings within one year or the normal operating cycle, if longer.

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