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Profit Sharing 401(k) Plan - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Contributions made by company | $ 20.2 | $ 16.2 | $ 14.4

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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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