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Marketable Securities (Tables)
 12 Months Ended
Mar. 28, 2020
Marketable Securities [Abstract]  
Schedule of Available-for-sale Securities
The following table is a summary of available-for-sale securities (in thousands):
 
As of March 28, 2020Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Estimated Fair Value
(Net Carrying Amount)
Corporate debt securities$286,668  $1,157  $(3,993) $283,832  
Non-US government securities12,483  260  —  12,743  
US Treasury securities8,839  167  —  9,006  
Total securities$307,990  $1,584  $(3,993) $305,581  
As of March 30, 2019Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Estimated Fair Value
(Net Carrying Amount)
Corporate debt securities$215,098  $1,027  $(600) $215,525  
Non-US government securities13,209  8  (40) 13,177  
Agency discount notes450  —  (1) 449  
Total securities$228,757  $1,035  $(641) $229,151  
Schedule of Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity
The cost and estimated fair value of available-for-sale investments by contractual maturity were as follows:
 
 March 28, 2020March 30, 2019
Amortized
Cost		Estimated
Fair Value		Amortized
Cost		Estimated
Fair Value
Within 1 year$22,012  $22,008  $70,490  $70,183  
After 1 year285,978  283,573  158,267  158,968  
Total$307,990  $305,581  $228,757  $229,151