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Profit Sharing 401(k) Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012
Defined Contribution Plan [Abstract] |  |  |
Contributions made by company | $ 13.3 | $ 13.4 | $ 9.4

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- Details
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Period Type: | duration

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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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