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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Income Taxes [Line Items] |  |  |  |
Excess benefit for share-based payments |  | $ 5,200,000 |  |
Reversal of deferred tax asset valuation allowance | $ 27,500,000 |  |  |
Valuation allowance |  |  | $ 37,500,000 |
Unrecognized tax benefits | 244,000 | 244,000 | 234,000 | $ 224,000
Impact on effective tax rate if recognized | 154,000 | 154,000 | 154,000 |
Interest and penalties |  | 120,000 | $ 110,000 |
Domestic Country |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss (NOL) carryforwards | $ 31,700,000 | $ 31,700,000 |  |
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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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition 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=6907707&loc=d3e32559-109319 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + 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=6907707&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 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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