Condensed Consolidating Financial Statements - Balance Sheet (Details) (USD $)	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010	Dec. 27, 2009	Dec. 30, 2012 Parent Company	Dec. 25, 2011 Parent Company	Dec. 30, 2012 Guarantors on a Combined Basis	Dec. 25, 2011 Guarantors on a Combined Basis	Dec. 30, 2012 Non-Guarantors on a Combined Basis	Dec. 25, 2011 Non-Guarantors on a Combined Basis	Dec. 30, 2012 Eliminations	Dec. 25, 2011 Eliminations	Dec. 30, 2012 Senior notes Senior Notes due June 2017	Jul. 27, 2011 Senior notes Senior Notes due June 2017	Mar. 25, 2011 Senior notes Senior Notes due June 2017	May 19, 2010 Senior notes Senior Notes due June 2017
Condensed Financial Statements, Captions [Line Items]
Principal amount outstanding	$ 630,700,000	$ 631,800,000											$ 625,000,000	$ 115,000,000	$ 285,000,000	$ 225,000,000
Current assets:
Cash and cash equivalents	49,000,000	69,600,000	10,800,000	9,900,000	37,800,000	52,600,000	(4,000,000)	2,800,000	15,200,000	14,200,000	0	0
Accounts receivable, net	271,900,000	245,300,000			0	0	253,500,000	225,400,000	18,400,000	19,900,000	0	0
Amounts due from affiliated companies	0	0			480,200,000	446,200,000	0	0	0	0	(480,200,000)	(446,200,000)
Inventoried costs	94,300,000	76,600,000			0	0	75,400,000	64,200,000	18,900,000	12,400,000	0	0
Other current assets	40,200,000	29,500,000			9,100,000	6,700,000	28,000,000	18,400,000	3,100,000	4,400,000	0	0
Total current assets	455,400,000	421,000,000			527,100,000	505,500,000	352,900,000	310,800,000	55,600,000	50,900,000	(480,200,000)	(446,200,000)
Amounts due from affiliated companies, long-term	0	0			0	0	24,000,000	26,000,000	0	0	(24,000,000)	(26,000,000)
Property, plant and equipment, net	85,600,000	72,500,000			1,300,000	1,200,000	74,700,000	62,200,000	9,600,000	9,100,000	0	0
Goodwill	596,500,000	571,600,000			0	0	574,800,000	550,200,000	21,700,000	21,400,000	0	0
Intangible assets, net	106,100,000	124,600,000			0	0	103,400,000	119,800,000	2,700,000	4,800,000	0	0
Investment in subsidiaries	0	0			439,800,000	460,100,000	28,800,000	20,500,000	0	0	(468,600,000)	(480,600,000)
Other assets	40,400,000	26,300,000			17,600,000	21,700,000	22,400,000	4,000,000	400,000	600,000	0	0
Total assets	1,284,000,000	1,216,000,000			985,800,000	988,500,000	1,181,000,000	1,093,500,000	90,000,000	86,800,000	(972,800,000)	(952,800,000)
Current liabilities:
Accounts payable	83,600,000	48,800,000			2,800,000	8,500,000	75,200,000	37,500,000	5,600,000	2,800,000	0	0
Accrued expenses	52,700,000	50,700,000			7,000,000	2,300,000	42,300,000	45,100,000	3,400,000	3,300,000	0	0
Accrued compensation	47,800,000	39,800,000			2,900,000	3,700,000	41,800,000	33,300,000	3,100,000	2,800,000	0	0
Billings in excess of costs and earnings on uncompleted contracts	43,700,000	36,200,000			0	0	40,500,000	34,300,000	3,200,000	1,900,000	0	0
Deferred income tax liability	28,900,000	8,500,000			0	0	28,900,000	8,500,000	0	0	0	0
Amounts due to affiliated companies	0	0			0	0	455,100,000	414,500,000	25,100,000	31,700,000	(480,200,000)	(446,200,000)
Other current liabilities	22,300,000	29,800,000			1,100,000	5,900,000	19,300,000	21,700,000	1,900,000	2,200,000	0	0
Total current liabilities	279,000,000	213,800,000			13,800,000	20,400,000	703,100,000	594,900,000	42,300,000	44,700,000	(480,200,000)	(446,200,000)
Long-term debt, net of current portion	648,400,000	653,600,000			643,600,000	647,800,000	0	0	4,800,000	5,800,000	0	0
Deferred tax liability	0	2,500,000				0		2,500,000		0		0
Amounts due to affiliated companies	0	0			0	0	0	0	24,000,000	26,000,000	(24,000,000)	(26,000,000)
Other long-term liabilities	32,500,000	33,500,000			4,300,000	7,700,000	26,100,000	23,800,000	2,100,000	2,000,000	0	0
Total liabilities	959,900,000	903,400,000			661,700,000	675,900,000	729,200,000	621,200,000	73,200,000	78,500,000	(504,200,000)	(472,200,000)
Total stockholders' equity	324,100,000	312,600,000	169,900,000	124,900,000	324,100,000	312,600,000	451,800,000	472,300,000	16,800,000	8,300,000	(468,600,000)	(480,600,000)
Total liabilities and stockholders' equity	$ 1,284,000,000	$ 1,216,000,000			$ 985,800,000	$ 988,500,000	$ 1,181,000,000	$ 1,093,500,000	$ 90,000,000	$ 86,800,000	$ (972,800,000)	$ (952,800,000)