Acquisitions (Cost of Acquired Entity) (Details) (USD $)	3 Months Ended		1 Months Ended		3 Months Ended					0 Months Ended
	Sep. 25, 2011 Rudd Lighting, Inc. [Member]	Aug. 17, 2011 Rudd Lighting, Inc. [Member]	Aug. 17, 2011 Rudd Lighting, Inc. [Member] Common Stock [Member]		Mar. 27, 2011 LLF Acquisition [Member]	Mar. 28, 2010 LLF Acquisition [Member]	Mar. 29, 2009 LLF Acquisition [Member]	Feb. 29, 2008 LLF Acquisition [Member]	Feb. 29, 2008 LLF Acquisition [Member] Stock Options [Member]	Feb. 29, 2008 LLF Acquisition [Member] Common Stock [Member]
Business Acquisition, Cost of Acquired Entity [Abstract]
Cash consideration paid to acquired company's stockholders		$ 372,235,000						$ 16,500,000
Fair value of common stock issued by the Company			211,040,000	[1]						58,800,000
Fair value of debt paid on behalf of acquired company's stockholders		84,991,000
Total Purchase Price		668,266,000						80,800,000
Shares issued for acquisition			6,074,833							1,900,000
Common stock, closing market price per share			$ 34.74
Expiration of transfer restrictions under stock purchase agreement			25.00%
Transaction cost		3,600,000						1,000,000
Transaction cost expensed	3,100,000
Value of the assumption of fully vested LLF employee stock options									4,500,000
Contingent costs of acquisition								26,400,000
Payments for Previous Acquisition					$ 13,200,000	$ 8,800,000	$ 4,400,000

[1] Represents 6,074,833 shares of the Company's common stock at $34.74 per share, the closing share price on August 17, 2011. The shares are subject to certain transfer restrictions under the Stock Purchase Agreement that will generally lapse with respect to 25% of the shares held (i) at the completion of the consecutive six-month period following the date of the closing of the transaction; and, (ii) at the completion of each of the following three successive six-month periods, such that all restrictions will lapse by the second anniversary of the closing.