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Marketable Securities (Tables)
 6 Months Ended
Sep. 29, 2018
Marketable Securities [Abstract]  
Schedule of Available-for-sale Securities
The following table is a summary of available-for-sale securities at March 31, 2018 (in thousands):
໿
໿
As of March 31, 2018
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
(Net Carrying
Amount)
Corporate debt securities
$
185,636

 
$
4

 
$
(2,318
)
 
$
183,322

Non-US government securities
14,730

 
—

 
(111
)
 
14,619

Certificates of deposit
500

 
—

 
—

 
500

Agency discount notes
459

 
—

 
(4
)
 
455

Total securities
$
201,325

 
$
4

 
$
(2,433
)
 
$
198,896

The following table is a summary of available-for-sale securities at September 29, 2018 (in thousands):
As of September 29, 2018
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
(Net Carrying
Amount)
Corporate debt securities
$
187,939

 
$
3

 
$
(2,035
)
 
$
185,907

Non-US government securities
13,698

 
—

 
(155
)
 
13,543

Agency discount notes
461

 
—

 
(3
)
 
458

Total securities
$
202,098

 
$
3

 
$
(2,193
)
 
$
199,908
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):
໿

September 29, 2018
 
March 31, 2018

Amortized
 
Estimated
 
Amortized
 
Estimated

Cost
 
Fair Value
 
Cost
 
Fair Value
Within 1 year
$
49,023

 
$
48,701

 
$
26,560

 
$
26,397

After 1 year
153,075

 
151,207

 
174,765

 
172,499

Total
$
202,098

 
$
199,908

 
$
201,325

 
$
198,896