Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended			12 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 29, 2013	Jan. 03, 2016	Dec. 28, 2014	Dec. 29, 2013
Income Tax [Line Items]
Tax rate				34.40%	35.10%	27.40%
Effective income tax rate with noncontrolling interest				36.60%	38.40%	30.50%
Uncertain tax positions				$ 2,900,000	$ 2,900,000
Uncertain tax positions that would affect tax rate				2,900,000	2,900,000
Change in uncertain tax positions, expected material impact on consolidated financial statements				0
Reduction of liability for uncertain tax positions	$ 600,000	$ 600,000	$ 3,400,000
Decrease in income tax expense				600,000	600,000	$ 900,000
Credit to income tax expense						400,000
Decrease in corporate income tax expense due to state tax rate change				1,100,000		$ 2,300,000
Valuation allowance for deferred tax assets				2,307,000	3,640,000
Valuation allowance included in net current income tax assets					$ 200,000
Certain State Tax Jurisdictions [Member]
Income Tax [Line Items]
Federal net operating losses				$ 54,900,000
Net operating loss carryforwards expiration ending year				2034
Domestic Tax Authority [Member]
Income Tax [Line Items]
Federal net operating losses				$ 2,500,000
Net operating loss carryforwards expiration ending year				2032
Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member]
Income Tax [Line Items]
Tax year open for examination				2012
Earliest Tax Year [Member] | Certain State Tax Jurisdictions [Member]
Income Tax [Line Items]
Tax year open for examination				1998
State [Member]
Income Tax [Line Items]
State tax rate				5.00%	6.00%	6.90%
Tax rate after future reduction				4.00%