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Components of Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
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Accrued Expenses and Other Current Liabilities [Line Items] |  |
Accrued wages and benefits | $ 18,932 | $ 15,578
Accrued insurance and environmental costs | 58,470 | 52,934
Other accrued expenses and other current liabilities | 9,740 | 10,006
Total accrued expenses and other current liabilities | $ 87,142 | $ 78,518

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