Income Taxes Deferred tax liabilities and assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]
Property and equipment	$ 82,627	$ 82,168
Investments	95,445	92,802
Other intangible assets, including goodwill	717,583	742,474
Other	13,095	10,988
Gross deferred tax liability	908,750	928,432
Insurance	41,443	38,927
Employee compensation and benefits	214,847	190,106
Accruals and allowances	43,781	32,313
Derivatives	31,879	56,207
Net operating loss/credit carryforwards and other	37,509	9,287
Gross deferred tax asset, before valuation allowances	369,459	326,840
Valuation allowances	(15,187)	(10,426)
Net deferred tax liability	$ 554,478	$ 612,018