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Investments - Cost and Estimated Available-For-Sale Debt Securities (Details) - USD ($)
$ in Thousands
Apr. 01, 2018
Apr. 02, 2017
Amortized Cost    
Due in 1 year or less $ 119,172 $ 188,008
Due in 1-2 years 111,814 46,089
Due in 2-5 years 63,996 101,700
Total investments in available-for-sale debt securities 294,982 335,797
Estimated Fair Value    
Due in 1 year or less 119,056 187,984
Due in 1-2 years 110,226 45,995
Due in 2-5 years 63,023 101,011
Total investments in available-for-sale debt securities $ 292,305 $ 334,990