Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Income Tax Reconciliation [Abstract]
Income tax provision at federal statutory tax rate	$ 29,768	$ 33,346	$ 27,792
Impact of Partnership income not subject to federal income taxes	(32,148)	(38,919)	(35,187)
Permanent differences	210	86	71
Change in valuation allowance	2,181	5,458	9,771
State income taxes	253	(60)	(1,135)
Other	436	856	(705)
Provision for income taxes - current and deferred	$ 700	$ 767	$ 607