Departure of Executive Officers (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	1 Months Ended		0 Months Ended	1 Months Ended	0 Months Ended	1 Months Ended	12 Months Ended
	May 19, 2010 Selling, General and Administrative Expenses [Member] Chief Executive Officer and Chief Financial Officer [Member]	Dec. 25, 2010 Selling, General and Administrative Expenses [Member] Senior Vice President [Member]	Oct. 31, 2011 Cost of Revenues [Member] Senior Vice President [Member]	May 19, 2010 Severance Expense [Member] Selling, General and Administrative Expenses [Member] Chief Executive Officer and Chief Financial Officer [Member]	Dec. 25, 2010 Severance Expense [Member] Selling, General and Administrative Expenses [Member] Senior Vice President [Member]	May 19, 2010 Share-based Compensation Payments [Member] Selling, General and Administrative Expenses [Member] Chief Executive Officer and Chief Financial Officer [Member]	Dec. 25, 2010 Share-based Compensation Payments [Member] Selling, General and Administrative Expenses [Member] Senior Vice President [Member]	Dec. 31, 2011 Payroll and Other Expenses [Member] Cost of Revenues [Member] Senior Vice President [Member]	Dec. 31, 2011 Share-based Compensation Expense [Member] Cost of Revenues [Member] Senior Vice President [Member]
Separation Agreement [Line Items]
Executive departure expenses	$ 0.7	$ 0.2	$ 0.8	$ 0.8	$ 0.3	$ 0.1	$ 0.1	$ 0.5	$ 0.3