Summary of Accounts Receivable (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Financing Receivables [Line Items]
Trade and accrued trade receivables	$ 36,751,000	$ 53,268,000
Allowance for doubtful accounts	(250,000)	(250,000)
Accrued receivable for workers' compensation stop loss policy	495,000	623,000
Other	492,000	78,000
Total accounts receivable	$ 37,488,000	$ 53,719,000