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Marketable Securities - Schedule of Amortized Cost and Estimated Fair Value of Debt Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2014
Mar. 30, 2014
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, Amortized Cost $ 16,734  
Due after one year through three years, Amortized Cost 131,683  
Due after three years through five years, Amortized Cost 19,417  
Due after five years, Amortized Cost 21,812  
Available-for-sale securities, Amortized Cost 189,646 186,568
Due in one year or less, Estimated Fair Value 16,756  
Due after one year through three years, Estimated Fair Value 131,778  
Due after three years through five years, Estimated Fair Value 19,400  
Due after five years, Estimated Fair Value 21,905  
Total estimated fair value of debt securities $ 189,839 $ 186,783