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Discontinued Operations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 2011
Apr. 19, 2012
East Mississippi Correctional Facility [Member]
bed
Aug. 13, 2012
Marshall County Correctional Facility [Member]
bed
Jul. 01, 2012
Walnut Grove Youth Correctional Facility [Member]
bed
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of beds discontinued         1,500 1,000 1,450
Disposal Group, Including Discontinued Operation, Revenue $ 11.2 $ 11.0 $ 22.3 $ 22.4