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Shareholders' Equity - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Sep. 26, 2015 USD ($) $ / Voting_Rights $ / shares shares | Sep. 27, 2014 USD ($) $ / shares shares | Sep. 28, 2013 USD ($) | Sep. 24, 2011 USD ($)
Class of Stock [Line Items] |  |  |  |
Repurchase of common stock | $ | $ 15,124,000 | $ 2,000 | $ 1,503,000 |
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Authorized amount to repurchase stock | $ |  |  |  | $ 100,000,000
Repurchase of common stock | $ | $ 15,100,000 |  |  |
Aggregate stock repurchased shares | shares | 7,900,000 |  |  |
Aggregate stock repurchased value | $ | $ 65,000,000 |  |  |
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock authorized | shares | 80,000,000 |  |  |
Common stock, par value | $ / shares | $ 0.01 |  |  |
Common stock, shares outstanding | shares | 11,908,317 |  |  |
Repurchase of common stock | $ | $ 5,000 | 0 | 0 |
Class A Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock authorized | shares | 100,000,000 |  |  |
Common stock, par value | $ / shares | $ 0.01 |  |  |
Common stock, shares outstanding | shares | 36,462,299 |  |  |
Repurchase of common stock | $ | $ 12,000 | $ 0 | 1,000 |
Class B Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock authorized | shares | 3,000,000 | 3,000,000 |  |
Common stock, par value | $ / shares | $ 0.01 | $ 0.01 |  |
Common stock, shares outstanding | shares | 1,652,262 | 1,652,262 |  |
Percentage of vote cast for shares | 49.00% |  |  |
Convertible shares conversion ratio | 1 |  |  |
Repurchase of common stock | $ | $ 0 | $ 0 | $ 0 |
Maximum [Member] | Class B Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of voting powers | $ / Voting_Rights | 10 |  |  |
Minimum [Member] | Class B Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of voting powers | $ / Voting_Rights | 1 |  |  |

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