Marketable Securities - Schedule of Amortized Cost and Estimated Fair Value of Debt Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Available For Sale Securities Debt Maturities Fair Value [Abstract]
Due in one year or less, Amortized Cost	$ 25,933
Due after one year through three years, Amortized Cost	118,551
Due after three years through five years, Amortized Cost	18,255
Due after five years, Amortized Cost	23,829
Total amortized cost of debt securities	186,568	357,608
Due in one year or less, Estimated Fair Value	25,953
Due after one year through three years, Estimated Fair Value	118,756
Due after three years through five years, Estimated Fair Value	18,205
Due after five years, Estimated Fair Value	23,869
Available-for-sale securities, Estimated Fair Value	$ 186,783	$ 359,974