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Long-Term Debt - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 22, 2016 | Nov. 09, 2015 | Dec. 31, 2015 | Dec. 26, 2015 | Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Components of long-term debt |  |  |  |  |  |  |
Interest expense |  |  |  |  | $ 28,209,000 | $ 42,847,000 | $ 40,027,000
Non-cash charge |  |  |  | $ 3,300,000 | 0 | 3,337,000 | $ 537,000
Unamortized debt issuance costs |  |  |  |  | 4,800,000 |  |
Senior notes |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  | $ 4,840,000 | $ 5,635,000 |
Senior notes | Senior Notes Due November 2023 |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Debt, aggregate principal amount |  | $ 400,000,000.0 |  |  |  |  |
Debt instrument interest rate stated, percentage |  | 6.125% |  |  | 6.125% |  |
Debt issuance costs |  | $ 6,300,000 |  |  |  |  |
Debt redemption price percentage |  | 35.00% |  |  |  |  |
Senior notes | Senior Notes Due November 2023 | Redemption prior to November 15, 2018 |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Debt redemption price percentage |  | 106.125% |  |  |  |  |
Senior notes | Senior Notes Due November 2023 | Redemption on or after November 15, 2018 |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Debt redemption price percentage |  | 104.594% |  |  |  |  |
Senior notes | Senior Notes Due November 2023 | Redemption on or after November 15, 2019 |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Debt redemption price percentage |  | 103.063% |  |  |  |  |
Senior notes | Senior Notes Due November 2023 | Redemption on or after November 15, 2020 |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Debt redemption price percentage |  | 101.531% |  |  |  |  |
Senior notes | Senior Notes Due November 2023 | Redemption on or after November 15, 2021 |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Debt redemption price percentage |  | 100.00% |  |  |  |  |
Senior notes | Senior Notes Due November 2023 | Upon change of control |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Debt redemption price percentage |  | 101.00% |  |  |  |  |
Senior notes | Senior Notes Repaid December 2015 |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Debt instrument interest rate stated, percentage |  |  | 8.25% |  | 8.25% |  |
Debt, aggregate principal amount redeemed |  |  |  | $ 400,000,000 |  |  |
Debt redemption percentage |  |  | 102.063% |  |  |  |
Charge recognized during debt redemption |  |  | $ 8,300,000 |  |  |  |
Interest expense payment reriod |  |  | 30 days |  |  |  |
Interest expense |  |  | $ 2,700,000 |  |  |  |
Non-cash charge |  |  | $ 3,300,000 |  |  |  |
Asset-based revolving credit facility | Asset-based Revolving Credit Facility |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  | $ 1,200,000 |  |
Credit facility, maximum principal amount | $ 400,000,000.0 |  |  |  |  |  |
Credit facility, additional borrowings available | $ 200,000,000.0 |  |  |  |  |  |
Credit facility, maturity date | Apr. 22, 2021 |  |  |  |  |  |
Borrowings outstanding |  |  |  |  | 0 |  |
Letters of credit outstanding |  |  |  |  | 0 |  |
Other letters of credit outstanding |  |  |  |  | 1,800,000 |  |
Borrowing availability |  |  |  |  | $ 368,900,000 |  |
Credit facility, base rate computation, option second description, basis spread percentage |  |  |  |  | 0.50% |  |
Credit facility, basis percentage for calculation of variable rate spread |  |  |  |  | 1.00% |  |
Debt instrument fixed charge coverage ratio |  |  |  |  | 1.00 |  |
Asset-based revolving credit facility | Asset-based Revolving Credit Facility | LIBOR |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility |  |  |  |  | 1.25% |  |
Applicable interest rate on the credit facility |  |  |  |  | 2.50% |  |
Asset-based revolving credit facility | Asset-based Revolving Credit Facility | Base Rate |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility |  |  |  |  | 0.25% |  |
Applicable interest rate on the credit facility |  |  |  |  | 4.50% |  |
Asset-based revolving credit facility | Asset-based Revolving Credit Facility | Minimum | LIBOR |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility |  |  |  |  | 1.25% |  |
Asset-based revolving credit facility | Asset-based Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility |  |  |  |  | 0.25% |  |
Asset-based revolving credit facility | Asset-based Revolving Credit Facility | Maximum | LIBOR |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility |  |  |  |  | 1.50% |  |
Asset-based revolving credit facility | Asset-based Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |
Components of long-term debt |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility |  |  |  |  | 0.50% |  |

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