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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Apr. 01, 2012
Amortized Cost    
Due in 1 year or less $ 186,747 $ 290,342
Due in 1-2 years 25,053 10,248
Due in 2-5 years 44,973 1,905
Total investments in available-for-sale debt securities 256,773 302,495
Estimated Fair Value    
Due in 1 year or less 186,771 290,334
Due in 1-2 years 25,038 10,290
Due in 2-5 years 44,967 1,907
Total investments in available-for-sale debt securities $ 256,776 $ 302,531