|
Stock Based Compensation (Details) (USD $)
|
3 Months Ended |
12 Months Ended |
|
Apr. 27, 2014
|
Apr. 28, 2013
|
Jan. 26, 2014
|
| Share-based Compensation |
|
|
|
|
| Cost of revenue |
$ 2,919,000 |
|
$ 2,653,000 |
|
| Research and development |
20,494,000 |
|
21,935,000 |
|
| Sales, general and administrative |
12,108,000 |
|
8,809,000 |
|
| Stock based compensation expense |
35,521,000 |
|
33,397,000 |
|
| Stock Options granted (in shares) |
7,800 |
|
2,800,000 |
|
| Weighted average grant-date fair value per option |
$ 4.60 |
|
$ 3.11 |
|
| RSUs and PSUs granted (in shares) |
3,254,000 |
[1] |
4,900,000 |
|
| Weighted average grant-date fair value of RSUs and PSUs |
$ 17.13 |
|
$ 11.72 |
|
| Stock-based compensation expense related to equity awards not expected to vest |
10,000,000 |
|
11,800,000 |
|
| Aggregate amount of unearned stock-based compensation expense related to equity awards, adjusted for estimated forfeitures |
259,600,000 |
|
|
241,300,000 |
| Unearned stock-based compensation expense related to stock options weighted average amortization period (in years) |
2 years 3 months 17 days |
|
|
2 years 6 months 0 days |
| Unearned stock-based compensation expense related to RSUs/PSUs weighted average amortization period (in years) |
2 years 9 months 17 days |
|
|
2 years 8 months 12 days |
| Stock Options |
|
|
|
|
| Stock options beginning balance (in shares) |
32,504,000 |
|
|
|
| Stock Options granted (in shares) |
7,800 |
|
2,800,000 |
|
| Stock options exercised (in shares) |
(4,801,000) |
|
|
|
| Stock options cancelled (in shares) |
(486,000) |
|
|
|
| Stock options ending balance (in shares) |
27,225,000 |
|
|
32,504,000 |
| Weighted average exercise price of stock options at beginning of period |
$ 14.22 |
|
|
|
| Weighted average exercise price of stock options granted |
$ 17.20 |
|
|
|
| Weighted average exercise price of stock options exercised |
$ 13.14 |
|
|
|
| Weighted average exercise price of stock options cancelled |
$ 20.31 |
|
|
|
| Weighted average exercise price of stock options at end of period |
$ 14.30 |
|
|
$ 14.22 |
| RSUs/PSUs |
|
|
|
|
| RSUs/PSUs beginning balance (in shares) |
18,852,000 |
|
|
|
| RSUs and PSUs granted (in shares) |
3,254,000 |
[1] |
4,900,000 |
|
| RSUs/PSUs vested (in shares) |
(3,303,000) |
|
|
|
| RSUs/PSUs cancelled (in shares) |
(367,000) |
|
|
|
| RSUs/PSUs ending balance (in shares) |
18,436,000 |
|
|
18,852,000 |
| Weighted average grant date fair value of RSUs/PSUs at beginning of period |
$ 13.82 |
|
|
|
| Weighted average grant-date fair value of RSUs and PSUs |
$ 17.13 |
|
$ 11.72 |
|
| Weighted average grant-date fair value of RSUs/PSUs vested |
$ 13.31 |
|
|
|
| Weighted average grant date fair value of RSUs/PSUs cancelled |
$ 13.24 |
|
|
|
| Weighted average grant date fair value of RSUs/PSUs at end of period |
$ 14.51 |
|
|
$ 13.82 |
| Maximum number of PSUs issuable |
2,500,000 |
|
|
|
| Minimum number of PSUs issuable |
0 |
|
|
|
|
Minimum
|
|
|
|
|
| Share-based Compensation |
|
|
|
|
| Weighted average expected life (in years) |
3 years 2 months 12 days |
|
3 years 2 months 12 days |
|
|
Maximum
|
|
|
|
|
| Share-based Compensation |
|
|
|
|
| Weighted average expected life (in years) |
3 years 2 months 12 days |
|
3 years 3 months 17 days |
|
|
Stock Options
|
|
|
|
|
| Share-based Compensation |
|
|
|
|
| Estimated grant-date fair value |
35,880 |
|
8,700,000 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used |
(Using a binomial model) |
|
(Using a binomial model) |
|
| Risk free interest rate, minimum (in hundredths) |
2.80% |
|
1.80% |
|
| Risk free interest rate, maximum (in hundredths) |
2.80% |
|
2.10% |
|
| Volatility rate, minimum (in hundredths) |
31.00% |
|
32.00% |
|
| Volatility rate, maximum (in hundredths) |
31.00% |
|
37.00% |
|
| Dividend yield minimum |
1.90% |
|
2.30% |
|
| Dividend yield maximum |
1.90% |
|
2.40% |
|
|
RSUs and PSUs
|
|
|
|
|
| Share-based Compensation |
|
|
|
|
| Estimated grant-date fair value |
$ 55,700,000 |
|
$ 57,400,000 |
|
|
Employee Stock Purchase Plan
|
|
|
|
|
| Share-based Compensation |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used |
(Using a Black-Scholes model) |
|
(Using a Black-Scholes model) |
|
| Risk free interest rate, minimum (in hundredths) |
0.10% |
|
0.10% |
|
| Risk free interest rate, maximum (in hundredths) |
0.30% |
|
0.30% |
|
| Volatility rate, minimum (in hundredths) |
31.00% |
|
37.00% |
|
| Volatility rate, maximum (in hundredths) |
31.00% |
|
37.00% |
|
| Dividend yield minimum |
1.90% |
|
2.40% |
|
| Dividend yield maximum |
1.90% |
|
2.40% |
|
|
Employee Stock Purchase Plan | Minimum
|
|
|
|
|
| Share-based Compensation |
|
|
|
|
| Weighted average expected life (in years) |
0 years 6 months 0 days |
|
0 years 6 months 0 days |
|
|
Employee Stock Purchase Plan | Maximum
|
|
|
|
|
| Share-based Compensation |
|
|
|
|
| Weighted average expected life (in years) |
2 years 0 months 0 days |
|
2 years 0 months 0 days |
|
|
|
|