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Marketable Securities (Tables)
 12 Months Ended
Mar. 31, 2018
Marketable Securities [Abstract]  
Schedule of Available-for-sale Securities
As of March 25, 2017
Amortized
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated Fair Value
(Net Carrying Amount)
Corporate debt securities
$
33,350

 
$
—

 
$
(20
)
 
$
33,330

Commercial paper
66,518

 
—

 
(35
)
 
66,483

Total securities
$
99,868

 
$
—

 
$
(55
)
 
$
99,813

The following table is a summary of available-for-sale securities (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
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 31, 2018
 
March 25, 2017
 
Amortized
Cost
 
Estimated
Fair Value
 
Amortized
Cost
 
Estimated
Fair Value
Within 1 year
$
26,560

 
$
26,397

 
$
99,868

 
$
99,813

After 1 year
174,765

 
172,499

 
—

 
—

Total
$
201,325

 
$
198,896

 
$
99,868

 
$
99,813