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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net tax benefit | $ (1,852,000) | $ (9,094,000) | $ (1,484,000) | $ (1,831,000) | $ (678,000) | $ (9,285,000) | $ (1,497,000) | $ (748,000) | $ (14,261,000) | $ (12,208,000) | $ 27,414,000
Reduction in income tax provision |  |  |  |  | 1,100,000 |  |  |  |  |  |
Decrease in uncertain tax positions | 264,000 |  |  |  |  |  |  |  | 264,000 |  |
Effective tax rate impact on prior year tax position | 177,000 |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits | 0 |  |  |  | 254,000 |  |  |  | 0 | 254,000 | $ 244,000
Impact on effective tax rate if recognized | 0 |  |  |  | 154,000 |  |  |  | 0 | 154,000 |
Interest and penalties |  |  |  |  |  |  |  |  | 0 | 130,000 |
Domestic Country |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss (NOL) carryforwards | 0 |  |  |  | $ 21,000,000 |  |  |  | $ 0 | $ 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 |  |
British Virgin Islands [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net tax benefit | $ 1,800,000 |  |  |  |  |  |  |  |  |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition 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. + References No definition available. + 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=84230637&loc=d3e32559-109319 + 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=84230637&loc=d3e32718-109319 + Details
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