Income Taxes - Narrative (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 24, 2012	Jun. 26, 2011	May 27, 2012	Dec. 25, 2011
Income Tax Contingency [Line Items]
Unrecognized tax benefits that if recognized would affect effective tax rate				$ 10.2
Income tax penalties and interest expense	0.3
Benefit for interest and penalties related to reversal of prior positions	(0.1)	(0.7)
Liabilities for uncertain tax positions that will expire within 12 months	(1.5)
Change of ownership condition, initial percent of ownership of a loss corporation	5.00%
Change of ownership condition, percent change in ownership of a loss corporation	50.00%
Change in ownership condition, period within which change in ownership must occur	3 years
Federal annual utilization of NOL carryforwards limit, next five years			28.1
Federal annual utilization of NOL carryforwards limit, after year five			11.6
Integral Systems, Inc. | Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Unrecognized tax benefits of Integral Systems, Inc., decrease based on updated analysis	(0.2)
Discontinued operations
Income Tax Contingency [Line Items]
Unrecognized tax benefits reduction relating to expiration of statutes of limitations	(0.1)
Continuing operations
Income Tax Contingency [Line Items]
Unrecognized tax benefits reduction resulting from completion of IRS audit	$ (0.3)