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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%

X

- 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

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A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings.

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Amount recognized for uncertainty in income taxes classified as current.

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

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