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Shareholders' Equity - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012 | Sep. 27, 2014 Common Stock [Member] | Jun. 25, 2011 Common Stock [Member] | Sep. 27, 2014 Class A Common Stock [Member] | Sep. 28, 2013 Class A Common Stock [Member] | Sep. 29, 2012 Class A Common Stock [Member] | Sep. 27, 2014 Class B Stock [Member] | Sep. 28, 2013 Class B Stock [Member] | Sep. 29, 2012 Class B Stock [Member] | Sep. 27, 2014 Maximum [Member] Class B Stock [Member] | Sep. 27, 2014 Minimum [Member] Class B Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock authorized |  |  |  | 80,000,000 |  | 100,000,000 |  |  | 3,000,000 | 3,000,000 |  |  |
Common stock, par value |  |  |  | $ 0.01 |  | $ 0.01 |  |  | $ 0.01 | $ 0.01 |  |  |
Common stock, shares outstanding |  |  |  | 12,437,307 |  | 36,887,311 |  |  | 1,652,262 | 1,652,262 |  |  |
Number of voting powers |  |  |  |  |  |  |  |  |  |  |  | 10 | 1
Percentage of vote cast for shares |  |  |  |  |  |  |  |  | 49.00% |  |  |  |
Convertible shares conversion ratio |  |  |  |  |  |  |  |  | 1 |  |  |  |
Authorized amount to repurchase stock |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |
Repurchase of common stock, shares |  |  |  |  |  | 300 | 165,900 | 1,904,700 |  | 0 | 0 |  |
Repurchase of common stock | 2,000 | 1,503,000 | 20,884,000 |  |  | 0 | 1,000 | 19,000 | 0 | 0 | 0 |  |
Aggregate stock repurchased shares |  |  |  | 6,300,000 |  |  |  |  |  |  |  |  |
Aggregate stock repurchased value |  |  |  | $ 49,900,000 |  |  |  |  |  |  |  |  |

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