Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
Oct. 02, 2015	Sep. 29, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Incremental tax benefit received upon exercise of non-qualified employee stock options	$ 2.0	$ 2.1	$ 0.6
Undistributed foreign earnings		668.4
Unrecognized tax benefit within the next twelve months		$ 1.4

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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