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Income Taxes - Additional Information (Detail) - USD ($) |  | 9 Months Ended
--- | --- | ---
Apr. 01, 2020 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Examination [Line Items] |  |  |
Gross liability for tax positions |  | $ 172,000 |
Tax positions that will be resolved within the next twelve months |  | $ 70,000 |
Income tax examination years description |  | The Company is no longer subject to U.S. Federal income tax examinations for the years prior to 2014. |
Domestic |  |  |
Income Tax Examination [Line Items] |  |  |
Effective income tax rate |  | 14.90% | 31.60%
Domestic | Minimum |  |  |
Income Tax Examination [Line Items] |  |  |
Income tax examination year |  | 2012 |
Domestic | Maximum |  |  |
Income Tax Examination [Line Items] |  |  |
Income tax examination year |  | 2015 |
Foreign | UNITED KINGDOM |  |  |
Income Tax Examination [Line Items] |  |  |
Effective income tax rate |  | 18.00% |
Foreign | Scenario, Forecast | UNITED KINGDOM |  |  |
Income Tax Examination [Line Items] |  |  |
Effective income tax rate | 17.00% |  |

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- Definition Percentage 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 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: 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=65882285&loc=d3e32687-109319 + Details
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