Assumptions Used to Estimate Fair Value of Warrants (Detail) (Warrant)	3 Months Ended
	Jun. 29, 2012	Jul. 01, 2011 Minimum		Jul. 01, 2011 Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Expected term (in years)	3 years 4 months 24 days	2 months 12 days	[1]	4 years 4 months 24 days	[1]
Volatility	66.05%	41.23%	[1]	69.52%	[1]
Expected dividend			[1]		[1]
Risk-free interest rate	2.00%	0.83%	[1]	2.00%	[1]

[1] As of July 1, 2011, the Company also had warrants recorded as a liability associated with certain Convertible Notes which had subsequently expired.