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Activity of Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 3,714	$ 5,981
Less: reversal of expense	(122)	(583)
Less: write-offs (net of recoveries)	(186)	(1,684)
Balance, end of period	$ 3,406	$ 3,714

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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