Business Combination (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended		3 Months Ended
	Jul. 03, 2011	Jul. 03, 2011	Jan. 02, 2011	Jul. 03, 2011 BIIHolding [Member]	Jul. 03, 2011 BIIHolding [Member]	Feb. 10, 2011 BIIHolding [Member]	Jul. 03, 2011 Cornell Companies, Inc. [Member]	Aug. 12, 2010 Cornell Companies, Inc. [Member]
Additional Business Combination (Textuals) [Abstract]
Outstanding common stock						100.00%		100.00%
Aggregate consideration of acquisition, Net of cash acquired								$ 618.3
Cash consideration						409.6
Cash acquired from acquisition				9.7
Merger consideration placed in escrow account for one-year period to satisfy applicable indemnification claims						12.5
Accrued interest outstanding under BI's senior term loan						78.4
Accrued interest outstanding under BI's senior subsidiary note purchase agreement						107.5
Non recurring transaction costs	0.7	6.6			4.3
Net increase in property and equipment					0.9
Decrease to intangible assets					0.6
Decrease in other non-current assets					0.1
Net decrease in goodwill			0.9		0.1
Revenue, excluding intercompany transactions		48.7			30.9
Earnings, excluding intercompany transactions		4.8			4.3
Recovery of accounts receivable and insurance settlement for property as reduction in operating expense							2.5
Business Combination (Textuals) [Abstract]
Non recurring transaction costs	$ 0.7	$ 6.6			$ 4.3