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Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 30, 2012
Jul. 01, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities measured at fair value $ 1,231,961 $ 1,123,777
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value 343,504  
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | U.S. Treasury Securities and Money Market Funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities measured at fair value 343,504  
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Municipal Bonds, U.S. Government-Sponsored Enterprises and Commercial Paper [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities measured at fair value 0  
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value 888,457  
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Securities and Money Market Funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities measured at fair value 0  
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Municipal Bonds, U.S. Government-Sponsored Enterprises and Commercial Paper [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities measured at fair value 888,457  
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value 1,231,961  
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury Securities and Money Market Funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities measured at fair value 343,504  
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal Bonds, U.S. Government-Sponsored Enterprises and Commercial Paper [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities measured at fair value $ 888,457