Discontinued Operations (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended		3 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011	Jan. 31, 2012 ASI	Feb. 29, 2012 KEO	Mar. 30, 2012 ASI And KEO	Dec. 31, 2011 ASI And KEO	Apr. 30, 2011 PSA	Jul. 01, 2011 PSA	Dec. 31, 2010 PSA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business			$ 337,470	$ 680,105	$ 132,000	$ 205,000			$ 680,000
Revenue of divested business	4,553,459	3,635,871	8,869,679	6,928,069				275,000			377,000
After-tax gain on sale of business	$ 0	$ 201,700	$ 93,700	$ 201,700			$ 94,000			$ 202,000
After-tax gain on sale of business, per diluted share (dollars per share)							$ 0.13			$ 0.29