Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 28, 2012	Sep. 28, 2012	Mar. 29, 2013 Scenario, Forecast [Member]
Income Tax [Line Items]
Estimated annual effective income tax rate			40.50%
Increase in gross unrecognized tax benefits	$ 1.3	$ 0.9
Reasonably possible decrease in unrecognized tax benefits in the next twelve months	$ 2.4	$ 2.4