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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Income Taxes [Line Items] |  |  |  |
Foreign pretax earnings | $ 27,800 | $ 33,000 | $ 45,200 |
Current foreign tax expense related to foreign tax withholdings | 4,600 | 6,500 | $ 5,300 |
Foreign tax credit carryforward | $ 10,286 | $ 14,590 |  |
Foreign tax credit carry forward year | 10 years |  |  |
U.S. federal statutory income tax rate | 35.00% | 35.00% | 35.00% |
Excess amount for financial reporting over tax basis of investments in foreign subsidiaries | $ 47,000 |  |  |
Unrecognized tax benefits | 6,480 | $ 6,799 | $ 4,634 | $ 4,554
Unrecognized tax benefits that would impact the effective tax rate if recognized | 5,800 |  |  |
Unrecognized tax benefits, accrued interest | 400 |  |  |
California Franchise Tax Board | Research Tax Credit Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Excess state research credit | 7,300 |  |  |
Valuation allowance | 7,300 |  |  |
United States |  |  |  |
Income Taxes [Line Items] |  |  |  |
Foreign tax credit carryforward | 9,600 |  |  |
U.S. Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | $ 17,100 |  |  |
Net operating loss carryforwards expiration dates | 2020 |  |  |
State |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | $ 300 |  |  |
Net operating loss carryforwards expiration dates | 2021 |  |  |
Foreign NOL carryforwards |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | $ 38,800 |  |  |
Foreign NOL carryforwards | China |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | $ 24,200 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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