Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 27, 2015
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 174,432
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	174,551
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	1,712,133
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	1,717,868
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	403,819
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	421,942
Available-for-sale Securities, Debt Maturities, Without Single Maturity Date, Amortized Cost Basis	2,290,384
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 2,314,361