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Significant Accounting Policies - Components of Cash and Cash Equivalents (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013
Cash and Cash Equivalents [Line Items]
Overnight repurchase agreements	$ 21,294us-gaap_MoneyMarketFundsAtCarryingValue	$ 26,407us-gaap_MoneyMarketFundsAtCarryingValue
Cash on hand - Restricted	1,000	1,000
Cash on hand - Unrestricted	21,425us-gaap_Cash	16,640us-gaap_Cash
Total	42,719	43,047	38,213	44,282
Other Noncurrent Assets [Member]
Cash and Cash Equivalents [Line Items]
Cash on hand - Restricted	1,000	1,000
Total	$ 1,000	$ 1,000

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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