Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Income Tax [Line Items]
Tax rate				35.10%	27.40%	41.00%
Effective income tax rate with noncontrolling interest				38.40%	30.50%	44.60%
Uncertain tax positions				$ 2,900,000	$ 2,800,000
Uncertain tax positions that would affect tax rate				2,900,000	2,800,000
Time period that uncertain tax positions not expected to materially change				12 months
Reduction of liability for uncertain tax positions	600,000	3,400,000	200,000
Decrease in income tax expense				600,000	900,000	200,000
Credit to income tax expense					400,000
Decrease in corporate income tax expense due to state tax rate change					2,300,000
Net operating loss carryforwards expiration ending year				2033
Valuation allowance for deferred tax assets				3,640,000	3,553,000
Valuation allowance included in net current income tax assets				200,000	200,000
State Tax Legislation [Member]
Income Tax [Line Items]
Federal net operating losses				71,300,000
Net operating loss carryforwards expiration ending year				2033
Domestic Tax Authority [Member]
Income Tax [Line Items]
Federal net operating losses				$ 3,300,000
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				2011
Earliest Tax Year [Member] | State Tax Legislation [Member]
Income Tax [Line Items]
Tax year open for examination				1997
State [Member]
Income Tax [Line Items]
State tax rate				6.00%	6.90%
Tax rate after future reduction				5.00%