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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
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