Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 28, 2012	Dec. 28, 2012	Mar. 29, 2013 Scenario, Forecast [Member]
Income Tax [Line Items]
Estimated annual effective income tax rate			40.10%
The tax benefit of the research and development credit which will be recognized in fourth quarter of fiscal year 2013		$ 8.0
Increase in gross unrecognized tax benefits	0.7	0.2
Reasonably possible decrease in unrecognized tax benefits in the next twelve months	$ 1.1	$ 1.1