Retirement Plans - Components of Net Pension Expense and Periodic Benefit Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 25, 2011
Medical Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$ 69	$ 55	$ 54
Interest cost	71	81	86
Amortization of prior service cost	78	78	78
Amortization of recognized losses	37	22	27
Net pension expense	255	236	245
Pension Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Expected return on assets	(4,699)	(4,094)	(3,819)
Service cost	4,889	3,901	3,532
Interest cost	4,478	4,366	4,187
Amortization of prior service cost	3	3	2
Amortization of recognized losses	2,987	2,113	1,536
Net pension expense	$ 7,658	$ 6,289	$ 5,438