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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 24, 2016 | Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015 | Nov. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Indefinite-lived intangible assets, impairment charge | $ 1,800 | $ 0 | $ 1,800 | $ 7,300 |
Indefinite-lived intangible assets, carrying value | 1,800 |  | 1,800 |  |
Carrying value of senior subordinated notes | 395,269 | 395,653 | 395,269 |  |
Senior notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying value of senior subordinated notes | 394,365 | 395,160 | 394,365 |  |
6.125% Senior Notes Due in November 2023 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying value of senior subordinated notes |  |  |  |  | $ 400,000
Debt instrument interest rate stated, percentage |  |  |  |  | 6.125%
6.125% Senior Notes Due in November 2023 | Senior notes | Estimate of Fair Value Measurement |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Estimated fair value of senior subordinated notes due 2018 | 430,300 | 427,900 | 430,300 |  |
6.125% Senior Notes Due in November 2023 | Senior notes | Carrying (Reported) Amount, Fair Value Disclosure |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying value of senior subordinated notes | $ 394,400 | $ 395,200 | $ 394,400 |  |

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- Definition Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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