Segment Information (Schedule Of Segment Revenue From Product Lines) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Product revenue, net	$ 310,133	$ 122,368	$ 602,913	$ 316,212
Audio Products [Member]
Segment Reporting Information [Line Items]
Product revenue, net	300,010	105,418	558,671	260,220
Energy Products [Member]
Segment Reporting Information [Line Items]
Product revenue, net	$ 10,123	$ 16,950	$ 44,242	$ 55,992