Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 26, 2015	Sep. 26, 2015	Dec. 27, 2014
Components of long-term debt
Total	$ 436,185	$ 396,982	$ 445,546
Less current portion	(292)	(291)	(50,289)
Long-term portion	435,893	396,691	395,257
Senior Notes [Member] \| Senior Notes, Interest at 6.125%, Payable Semi-annually, Principal Due May 2023 [Member]
Components of long-term debt
Notes	400,000	0	0
Asset-based Revolving Credit Facility, Interest at LIBOR Plus a Margin of 1.25% to 1.75% or Base Rate Plus a Margin of 0.25% to 0.75%, Final Maturity December 2018 [Member]
Components of long-term debt
Total	42,000	0	0
Senior Subordinated Notes [Member] \| Senior Subordinated Notes, Interest at 8.25%, Payable Semi-annually, Repaid in December 2015 [Member]
Components of long-term debt
Notes	0	400,000	450,000
Senior and Subordinated Notes [Member]
Components of long-term debt
Total	393,806	396,534	444,904
Unamortized discount	0	(309)	(440)
Unamortized debt issuance costs	(6,194)	(3,157)	(4,656)
Other Notes Payable [Member]
Components of long-term debt
Total	$ 379	$ 448	$ 642

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.22)
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-Publisher SEC
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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