Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 30, 2012	Sep. 30, 2012	Jun. 24, 2012	Mar. 25, 2012	Dec. 25, 2011	Sep. 25, 2011	Jun. 26, 2011	Mar. 27, 2011	Dec. 30, 2012 Segment	Dec. 25, 2011	Dec. 26, 2010
Segment Reporting Information [Line Items]
Number of principal business segments									2
Segment Reporting Information, Operating Income (Loss) [Abstract]
Service revenues									$ 450.0	$ 351.0	$ 284.8
Product sales									519.2	362.9	123.7
Total revenues	263.6	276.3	219.8	209.5	213.4	206.6	171.1	122.8	969.2	713.9	408.5
Depreciation and amortization									58.0	48.0	12.9
Operating income (loss) from continuing operations	(80.3)	14.1	7.4	9.1	9.7	9.7	8.7	1.4	(49.7)	29.5	23.1
Revenue from foreign subsidiaries									116.2	54.3	0
Revenue from foreign subsidiaries, percentage									12.00%	8.00%
Settlement with one of the Company's D&O insurance carriers											1.4
Impairment of goodwill and intangible assets									96.6	0	0
Acquisition expenses					1.2	3.7	1.8	5.8		12.5	3.1
Merger and acquisition related items	(2.7)	0.3	1.5	0.9					(2.7)	12.5	3.1
Assets	1,284.0				1,216.0				1,284.0	1,216.0
Assets of foreign subsidiaries	90.0				47.2				90.0	47.2
Trade names
Segment Reporting Information, Operating Income (Loss) [Abstract]
Intangible assets impairment charge									14.6
KGS
Segment Reporting Information, Operating Income (Loss) [Abstract]
Service revenues									264.0	238.8	248.5
Product sales									519.2	362.9	123.7
Total revenues									783.2	601.7	372.2
Depreciation and amortization									54.5	45.7	12.3
Operating income (loss) from continuing operations									(41.5)	35.4	25.1
Impairment of goodwill and intangible assets									83.7
Assets	1,104.0				1,028.8				1,104.0	1,028.8
KGS | Trade names
Segment Reporting Information, Operating Income (Loss) [Abstract]
Intangible assets impairment charge									1.7
PSS
Segment Reporting Information, Operating Income (Loss) [Abstract]
Service revenues									186.0	112.2	36.3
Product sales									0	0	0
Total revenues									186.0	112.2	36.3
Depreciation and amortization									3.5	2.3	0.6
Operating income (loss) from continuing operations									(2.5)	9.9	1.8
Assets	106.8				88.6				106.8	88.6
PSS | Trade names
Segment Reporting Information, Operating Income (Loss) [Abstract]
Intangible assets impairment charge									12.9
Discontinued operations
Segment Reporting Information, Operating Income (Loss) [Abstract]
Assets	7.5				12.1				7.5	12.1
Corporate activities
Segment Reporting Information, Operating Income (Loss) [Abstract]
Operating income (loss) from continuing operations									(5.7)	(15.8)	(3.8)
Assets	$ 65.7				$ 86.5				$ 65.7	$ 86.5