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401(k) Plan - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Defined Contribution Plan [Abstract] |  |  |
Contributions made by company | $ 19.2 | $ 18.6 | $ 20.2

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- References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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