Employee Pension and Profit Sharing Plans - Net Periodic Cost (Details) (Pension Plans, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Oct. 01, 2010
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9,961	$ 10,310	$ 8,308
Interest cost	13,001	13,086	11,769
Expected return on plan assets	(12,521)	(12,738)	(10,577)
Settlements	467	704	1,066
Amortization of prior service cost	6	6	6
Recognized net (gain) loss	2,392	1,608	1,234
Net periodic pension cost	$ 13,306	$ 12,976	$ 11,806