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Receivables - Summary of Analysis of Allowance for Doubtful Trade Accounts Receivable (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Period	$ 14,128	$ 4,351	$ 1,011
Charged to Costs and Expenses	7,742	9,777	3,340
Deductions
Other Adjustments
Balance at End of Period	$ 21,870	$ 14,128	$ 4,351

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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