Schedule of Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 25, 2011
Other Liabilities [Line Items]
Payroll and employee related accruals	$ 47.7	$ 75.7
Taxes payable	15.8	23.5
Restructuring and impairments	3.8	2.7
Other	15.6	23.8
Accrued expenses and other current liabilities	$ 82.9	$ 125.7