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Shareholders' Equity - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 24, 2016 USD ($) vote $ / shares shares | Sep. 26, 2015 $ / shares shares | Sep. 24, 2011 USD ($)
Class of Stock [Line Items] |  |  |
Preferred stock authorized (in shares) | 1,000,000 | 1,000,000 |
Preferred stock, par value (in usd per share) | $ / shares | $ 0.01 | $ 0.01 |
Preferred stock, shares outstanding | 0 | 0 |
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock authorized (in shares) | 80,000,000 |  |
Common stock, par value (in usd per share) | $ / shares | $ 0.01 |  |
Common stock, shares outstanding | 11,998,472 |  |
Authorized amount to repurchase stock | $ |  |  | $ 100,000,000
Aggregate stock repurchased shares | 7,900,000 |  |
Aggregate stock repurchased value | $ | $ 65,000,000 |  |
Class A Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock authorized (in shares) | 100,000,000 |  |
Common stock, par value (in usd per share) | $ / shares | $ 0.01 |  |
Common stock, shares outstanding | 37,418,572 |  |
Class B Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock authorized (in shares) | 3,000,000 | 3,000,000 |
Common stock, par value (in usd per share) | $ / shares | $ 0.01 | $ 0.01 |
Common stock, shares outstanding | 1,652,262 | 1,652,262 |
Percentage of vote cast for shares (percent) | 49.00% |  |
Convertible shares conversion ratio | 1 |  |
Minimum [Member] | Class B Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Number of voting powers | vote | 1 |  |
Maximum [Member] | Class B Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Number of voting powers | vote | 10 |  |

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