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Investments (Tables)
 12 Months Ended
Apr. 01, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Fair Value of Available-For-Sale Investments
The amortized cost and fair value of available-for-sale investments as of April 1, 2018 were as follows:
 
(in thousands)
Cost
 
Gross
Unrealized
 Gains
 
Gross
Unrealized
 Losses
 
Estimated Fair
 Value
U.S. government treasuries and agencies securities
$
61,166

 
$
—

 
$
(894
)
 
$
60,272

Money market funds
48,847

 
—

 
—

 
48,847

Asset-backed securities
16,797

 
—

 
(110
)
 
16,687

Corporate bonds
111,266

 
43

 
(1,704
)
 
109,605

International government bonds
2,650

 
—

 
(12
)
 
2,638

Corporate commercial paper
9,034

 
—

 
—

 
9,034

Bank deposits
45,080

 
—

 
—

 
45,080

Repurchase agreements
142

 
—

 
—

 
142

Total available-for-sale investments
294,982

 
43

 
(2,720
)
 
292,305

Less amounts classified as cash equivalents
(70,279
)
 
—

 
—

 
(70,279
)
Short-term investments
$
224,703

 
$
43

 
$
(2,720
)
 
$
222,026

The amortized cost and fair value of available-for-sale investments as of April 2, 2017 were as follows:
 
(in thousands)
Cost
 
Gross
Unrealized
 Gains
 
Gross
Unrealized
 Losses
 
Estimated Fair
 Value
U.S. government treasuries and agencies securities
$
62,048

 
$
16

 
$
(508
)
 
$
61,556

Money market funds
140,425

 
—

 
—

 
140,425

Asset-backed securities
13,865

 
5

 
(23
)
 
13,847

Corporate bonds
96,660

 
42

 
(326
)
 
96,376

International government bonds
5,423

 
2

 
(15
)
 
5,410

Corporate commercial paper
4,898

 
—

 
—

 
4,898

Bank deposits
12,305

 
—

 
—

 
12,305

Repurchase agreements
173

 
—

 
—

 
173

Total available-for-sale investments
335,797

 
65

 
(872
)
 
334,990

Less amounts classified as cash equivalents
(143,498
)
 
—

 
—

 
(143,498
)
Short-term investments
$
192,299

 
$
65

 
$
(872
)
 
$
191,492
Schedule of Cost and Estimated Fair Value of Available-For-Sale Debt Securities
The cost and estimated fair value of available-for-sale debt securities as of April 1, 2018, by contractual maturity, were as follows:
(in thousands)
Amortized
Cost
 
Estimated Fair
Value
Due in 1 year or less
$
119,172

 
$
119,056

Due in 1-2 years
111,814

 
110,226

Due in 2-5 years
63,996

 
63,023

Total investments in available-for-sale debt securities
$
294,982

 
$
292,305

The cost and estimated fair value of available-for-sale debt securities as of April 2, 2017, by contractual maturity, were as follows:
(in thousands)
Amortized
Cost
 
Estimated Fair
Value
Due in 1 year or less
$
188,008

 
$
187,984

Due in 1-2 years
46,089

 
45,995

Due in 2-5 years
101,700

 
101,011

Total investments in available-for-sale debt securities
$
335,797

 
$
334,990
Gross Unrealized Losses and Fair Value of Investments in Continuous Loss Position
The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses as of April 1, 2018, aggregated by investment category and length of time that individual securities have been in a continuous loss position.
 
Less Than 12 Months
 
12 Months or Greater
 
Total
(in thousands)
Fair
Value
 
Unrealized
 Loss
 
Fair
 Value
 
Unrealized
 Loss
 
Fair
Value
 
Unrealized
 Loss
Corporate bonds
$
78,726

 
$
(1,324
)
 
$
23,286

 
$
(380
)
 
$
102,012

 
$
(1,704
)
U.S. government treasuries and agencies securities
25,352

 
(221
)
 
34,920

 
(673
)
 
60,272

 
(894
)
Asset-backed securities
14,147

 
(90
)
 
2,540

 
(20
)
 
16,687

 
(110
)
International government bonds
—

 
—

 
2,638

 
(12
)
 
2,638

 
(12
)
Total
$
118,225

 
$
(1,635
)
 
$
63,384

 
$
(1,085
)
 
$
181,609

 
$
(2,720
)
The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses, as of April 2, 2017, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.
 
Less Than 12 Months
 
12 Months or Greater
 
Total
 
(in thousands)
Fair
 Value
 
Unrealized
 Loss
 
Fair
 Value
 
Unrealized
 Loss
 
Fair
 Value
 
Unrealized
 Loss
Corporate bonds
$
71,308

 
$
(326
)
 
$
—

 
$
—

 
$
71,308

 
$
(326
)
Asset-backed securities
11,294

 
(23
)
 
—

 
—

 
11,294

 
(23
)
U.S. government treasuries and agencies securities
55,497

 
(508
)
 
—

 
—

 
55,497

 
(508
)
International government bonds
2,634

 
(15
)
 
—

 
—

 
2,634

 
(15
)
Total
$
140,733

 
$
(872
)
 
$
—

 
$
—

 
$
140,733

 
$
(872
)