Goodwill and Acquisition-Related Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Dec. 25, 2011	Jun. 26, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 79,238	$ 79,238
Accumulated Amortization	(46,847)	(42,293)
Net	32,391	36,945
Estimated future amortization of intangible assets [Abstract]
Fiscal year 2012	3,759
Fiscal year 2013	6,709
Fiscal year 2014	6,420
Fiscal year 2015	6,220
Fiscal year 2016	4,681
Fiscal year 2017 and thereafter	4,602
Total	32,391
Goodwill [Line Items]
Total goodwill	121,570	121,570
Energy Saving Products [Member]
Goodwill [Line Items]
Total goodwill	33,190	33,190
HiRel [Member]
Goodwill [Line Items]
Total goodwill	18,959	18,959
Enterprise Power [Member]
Goodwill [Line Items]
Total goodwill	69,421	69,421
Completed Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Periods, minimum (in years)	4	4
Amortization Periods, maximum (in years)	12	12
Gross Carrying Amount	52,045	52,045
Accumulated Amortization	(31,865)	(28,560)
Net	20,180	23,485
Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Periods, minimum (in years)	5	5
Amortization Periods, maximum (in years)	12	12
Gross Carrying Amount	10,430	10,430
Accumulated Amortization	(6,003)	(5,455)
Net	4,427	4,975
Intellectual Property and Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Periods, minimum (in years)	2	2
Amortization Periods, maximum (in years)	15	15
Gross Carrying Amount	16,763	16,763
Accumulated Amortization	(8,979)	(8,278)
Net	$ 7,784	$ 8,485

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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