Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 27, 2009	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Schedule Of Income Taxes [Line Items]
Increase in our valuation allowance on DTAs	$ 19.6
Cumulative GAAP pretax income		5.0
Valuation allowance		24.9	22.4
State income taxes reduced by research tax credits		0.6	0.6	0.6
Net operating loss carryforwards, state		21.7
Net operating loss carryforwards, foreign		3.7
Net operating loss carryforwards, expiration year		2032
Tax credit carryforwards, foreign		3.0
Tax credit carryforwards, state		11.2
Accumulated undistributed earnings not provided of U.S. income taxes		16
Unrecognized tax benefits if recognized would reduce income tax expense and effective rate		2.5	3.1
Acrrued payment of interest and penalties		0.4	0.4
Interest expense recognized		$ 0.1	$ 0.2	$ 0.1
Minimum [Member]
Schedule Of Income Taxes [Line Items]
Tax credit carryforwards, expiration date		Dec. 31, 2014
Time period for assessment and collection of income taxes		4 years
Maximum [Member]
Schedule Of Income Taxes [Line Items]
Tax credit carryforwards, expiration date		Dec. 31, 2032
Time period for assessment and collection of income taxes		6 years