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Fair Value Measurements - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 01, 2015 | Jan. 31, 2015 | Sep. 26, 2015 | Sep. 26, 2015 | Sep. 27, 2014 | Sep. 28, 2013 | Mar. 08, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Indefinite-lived intangible assets, carrying value |  |  | $ 22,300,000 | $ 22,300,000 |  |  |
Indefinite-lived intangible assets, fair value |  |  | 15,000,000 | 15,000,000 |  |  |
Indefinite-lived intangible assets, impairment charge |  |  | 7,300,000 | 7,300,000 | $ 0 | $ 0 |
Goodwill impairment |  |  |  |  |  | $ 7,709,000 |
Carrying value of senior subordinated notes |  |  | 400,139,000 | 400,139,000 | 450,239,000 |  |
Senior Subordinated Notes, Net of Unamortized Discount, Interest at 8.25%, Payable Semi-annually, Principal Due March 2018 [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Debt, aggregate principal amount |  | $ 50,000,000 | 400,000,000 | $ 400,000,000 | 450,000,000 |  |
Debt, redemption of principal amount | $ 50,000,000 | $ 50,000,000 |  |  |  |  |
Redemption date of senior notes |  |  |  | Mar. 01, 2015 |  |  |
Debt redemption price percentage | 102.063% | 102.063% |  |  |  |  |
Carrying value of senior subordinated notes |  |  | 399,691,000 | $ 399,691,000 | 449,529,000 |  | $ 400,000,000
Senior Subordinated Notes, Net of Unamortized Discount, Interest at 8.25%, Payable Semi-annually, Principal Due March 2018 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Carrying value of senior subordinated notes |  |  | 399,700,000 | 399,700,000 | 449,500,000 |  |
Senior Subordinated Notes, Net of Unamortized Discount, Interest at 8.25%, Payable Semi-annually, Principal Due March 2018 [Member] | Level 1 [Member] | Portion at Fair Value, Fair Value Disclosure [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Estimated fair value of senior subordinated notes due 2018 |  |  | $ 410,500,000 | $ 410,500,000 | $ 459,500,000 |  |

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