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Segment Information (Schedule of Segment Revenue from Product Lines) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 29, 2014	Mar. 30, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 149,659	$ 218,883	$ 190,671	$ 155,125	$ 206,873	$ 310,133	$ 193,774	$ 99,006	$ 714,338	$ 809,786	$ 426,843
Audio Products [Member]
Segment Reporting Information [Line Items]
Net sales									667,739	754,769	350,743
Energy Products [Member]
Segment Reporting Information [Line Items]
Net sales									$ 46,599	$ 55,017	$ 76,100

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Period Type:	duration

X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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