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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]
Mar. 25, 2012
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    
Business Acquisition, Working Capital Adjustment   (1,623,000)                
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     666,643,000         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%            
Business Acquisition - Purchase Price Adjustment Cash Refund   1,000,000                
Business Acquisitions_Purchase Price Adjustment_Common Stock refunded   15,895                
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.(2) In accordance with the stock purchase agreement, the post-closing working capital adjustment was composed of approximately $1.0 million in cash and the return of 15,895 shares of the Company's common stock, each of which were received in the fourth quarter of fiscal 2012.