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Accrued Expenses and Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Components of accrued expenses and other current liabilities
Accrued wages and benefits	$ 15,578	$ 17,638
Accrued insurance and environmental costs	52,934	51,683
Other accrued expenses and other current liabilities	10,006	11,465
Total accrued expense and current liability	$ 78,518	$ 80,786

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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