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Components of Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Accrued Expenses and Other Current Liabilities [Line Items]
Accrued wages and benefits	$ 23,926	$ 18,932
Accrued insurance and environmental costs	64,357	58,470
Other accrued expenses and other current liabilities	14,651	9,740
Total accrued expenses and other current liabilities	$ 102,934	$ 87,142

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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