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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Taxes [Line Items]
Reversal of deferred tax asset valuation allowance		$ 27,500,000
Reduction in income tax provision	$ 1,100,000
Unrecognized tax benefits	254,000	244,000	$ 254,000	$ 244,000	$ 234,000
Impact on effective tax rate if recognized	154,000	$ 154,000	154,000	154,000
Interest and penalties			130,000	$ 120,000
Domestic Country
Income Taxes [Line Items]
Net operating loss (NOL) carryforwards	$ 21,000,000		$ 21,000,000
Operating loss carry forwards expiration year			2031
Share based compensation expenses excludes from net operating loss carryforwards			$ 14,600,000
Maximum [Member] | State And Local Jurisdiction
Income Taxes [Line Items]
Operating loss carry forwards expiration year			2032

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Income taxes.

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Reversal of deferred tax asset valuation allowance.

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Share based compensation expenses excludes from net operating loss carryforwards.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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-Name Accounting Standards Codification
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