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Stock-Based Employee Compensation (Tables)
 6 Months Ended
Oct. 02, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Compensation Expense
The following table summarizes stock-based compensation expense by line items appearing in the Company’s Condensed Consolidated Statements of Operations:
 
Three Months Ended
 
Six Months Ended
(in thousands)
October 2,
2016

September 27,
2015
 
October 2,
2016
 
September 27,
2015
Cost of revenue
$
802

 
$
645

 
$
1,581

 
$
1,327

Research and development
3,191

 
3,543

 
7,499

 
7,175

Selling, general and administrative
5,188

 
4,393

 
10,616

 
7,946

Discontinued operations
—

 
—

 
—

 
(32
)
Total stock-based compensation expense
$
9,181

 
$
8,581

 
$
19,696

 
$
16,416
Stock Option Activity
The following is a summary of the Company's stock option activity and related weighted average exercise prices for each category:
 
Six Months Ended October 2, 2016
(shares in thousands)
Shares
 
Price
Beginning stock options outstanding
2,594

 
$
10.47

Exercised (1)
(817
)
 
6.91

Canceled
(88
)
 
14.21

Ending stock options outstanding
1,689

 
$
11.99

Ending stock options exercisable
1,163

 
$
10.08

(1)
Upon exercise, the Company issues new shares of common stock.
Nonvested Restricted Stock Units Activity
 
Six Months Ended October 2, 2016
(shares in thousands)
Shares
 
Weighted-average grant date fair value per share
Beginning PSUs outstanding
204

 
$
9.04

Released
(78
)
 
7.85

Forfeited
(126
)
 
7.74

Ending PSUs outstanding
—

 
$
—

The following table summarizes the Company's restricted stock unit activity and related weighted-average exercise prices for each category for the six months ended October 2, 2016:
 
Six Months Ended October 2, 2016
(shares in thousands)
Shares
 
Weighted-average grant date fair value per share
Beginning RSUs outstanding
3,693

 
$
16.09

Granted
1,708

 
20.26

Released
(1,138
)
 
13.82

Forfeited
(304
)
 
17.49

Ending RSUs outstanding
3,959

 
$
18.43
Fair Value Assumptions
The following weighted average assumptions were used to calculate the fair value of the market-based equity award using a Monte Carlo simulation model:
 
June 15, 2016
June 15, 2015
June 15, 2014
Estimated fair value
$
28.01

$
33.08

$
21.00

Expected volatility
46.90
%
41.22
%
34.60
%
Expected term (in years)
1.80

1.80

1.80

Risk-free interest rate
0.70
%
0.65
%
0.38
%
Dividend yield
—
%
—
%
—
%
Employee Stock Purchase Plan Activity
Activity under the Company's ESPP for the six months ended October 2, 2016 is summarized in the following table:
(in thousands, except per share amounts)
 
Number of shares issued
280

Average issuance price
$
16.96

Number of shares available at October 2, 2016
3,492