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Financial Instruments Fair Value Disclosure (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 29, 2012
Mar. 30, 2012
Jun. 24, 2011
Assets:      
Short-term investments 22,383 [1] 26,245  
Convertible senior notes [Member]
     
Liabilities:      
Interest rate of long-term debt (in hundredths) 3.75% 3.75% 3.75%
Redeemable convertible subordinated debentures [Member]
     
Liabilities:      
Interest rate of long-term debt (in hundredths) 7.25% 7.25% 7.25%
Carrying Amount [Member]
     
Assets:      
Short-term investments 22,383 26,245  
Carrying Amount [Member] | Convertible senior notes [Member]
     
Liabilities:      
Convertible debt, fair value 10,500 10,500  
Carrying Amount [Member] | Redeemable convertible subordinated debentures [Member]
     
Liabilities:      
Convertible debt, fair value 23,704 23,704  
Estimated Fair Value [Member]
     
Assets:      
Short-term investments 22,383 26,245  
Estimated Fair Value [Member] | Convertible senior notes [Member]
     
Liabilities:      
Convertible debt, fair value 2,560 1,537  
Estimated Fair Value [Member] | Redeemable convertible subordinated debentures [Member]
     
Liabilities:      
Convertible debt, fair value 11,852 8,178  
[1] Included in short-term investments on the Company's condensed consolidated balance sheet.