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Marketable Securities (Tables)
 9 Months Ended
Dec. 28, 2019
Marketable Securities [Abstract]  
Schedule of Available-for-sale Securities
The following table is a summary of available-for-sale securities at December 28, 2019 (in thousands):
As of December 28, 2019Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
(Net Carrying
Amount)
Corporate debt securities$240,061  $2,802  $(22) $242,841  
Non-U.S. government securities14,094  98  (1) 14,191  
U.S. Treasury securities6,248  —  (20) 6,228  
Total securities$260,403  $2,900  $(43) $263,260  

The Company typically invests in highly-rated securities with original maturities generally ranging from one to three years. The Company specifically identified certain securities with an immaterial amount of gross unrealized losses at December 28, 2019. The total amortized cost of these securities was approximately $27.9 million.  Securities in a continuous unrealized loss position for more than 12 months as of December 28, 2019 had an immaterial aggregate amortized cost and aggregate unrealized loss. The Company may sell certain of its marketable securities prior to their stated maturities for strategic reasons including, but not limited to, anticipated or actual changes in credit rating and duration management.  When evaluating an investment for other-than-temporary impairment, the Company reviews factors including the length of time and extent to which fair value has been below cost basis, the financial condition of the issuer, changes in market interest rates and whether it is more likely than not the Company will be required to sell the investment before recovery of the investment’s cost basis. As of December 28, 2019, the Company did not consider any of its investments to be other-than-temporarily impaired.   

The following table is a summary of available-for-sale securities at March 30, 2019 (in thousands):
໿
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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-U.S. 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 securities by contractual maturities were as follows (in thousands):
໿
December 28, 2019March 30, 2019
AmortizedEstimatedAmortizedEstimated
CostFair ValueCostFair Value
Within 1 year$13,048  $13,098  $70,490  $70,183  
After 1 year247,355  250,162  158,267  158,968  
Total$260,403  $263,260  $228,757  $229,151