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| In millions, except per share items | Oct-31-15 | Jul-31-15 | Apr-30-15 | Jan-31-15 | Oct-31-14 | Jul-31-14 | Apr-30-14 | Jan-31-14 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Revenues | 343.1 | 329.9 | 285.9 | 292.3 | 394.0 | 406.5 | 331.0 | 352.0 |
| Revenues growth | -12.9% | -18.9% | -13.6% | -17.0% | -0.8% | 8.8% | -1.6% | -16.9% |
| Cost of revenues | 268.1 | 255.4 | 221.9 | 227.8 | 307.5 | 318.1 | 264.4 | 282.9 |
| Gross profit | 75.1 | 74.5 | 64.0 | 64.6 | 86.5 | 88.4 | 66.6 | 69.1 |
| Gross margin | 21.9% | 22.6% | 22.4% | 22.1% | 22.0% | 21.7% | 20.1% | 19.6% |
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| Operating expenses: | | | | | | | | |
| Research, development and related | 35.5 | 36.1 | 33.5 | 33.2 | 34.2 | 34.7 | 31.5 | 30.9 |
| Selling, general and administrative | 21.7 | 21.1 | 23.6 | 19.5 | 20.2 | 19.2 | 18.6 | 18.0 |
| Amortization of acquired patent portfolio | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 |
| Total operating expenses | 59.5 | 59.6 | 59.3 | 55.0 | 56.7 | 56.3 | 52.4 | 51.3 |
| Income from operations | 15.5 | 15.0 | 4.6 | 9.6 | 29.8 | 32.2 | 14.1 | 17.8 |
| Operating margin | 4.5% | 4.5% | 1.6% | 3.3% | 7.6% | 7.9% | 4.3% | 5.1% |
| Equity in earnings of investee | 0.5 | 0.4 | 1.0 | 1.3 | 1.0 | 0.9 | 0.7 | 0.8 |
| Interest expense, net | -0.2 | -0.2 | -0.3 | -0.4 | -0.4 | -0.5 | -0.5 | -0.5 |
| Other income, net | 0.8 | 1.1 | 1.4 | 0.3 | 0.2 | 1.0 | 0.8 | 24.0 |
| Income before income taxes | 16.7 | 16.2 | 6.8 | 10.8 | 30.6 | 33.7 | 18.3 | 42.3 |
| Provision for (benefit from) income taxes | 2.7 | -2.0 | 0.8 | -3.2 | 2.6 | -11.6 | 3.2 | 11.7 |
| Net income | 13.9 | 18.2 | 6.0 | 14.0 | 28.0 | 45.3 | 15.1 | 30.6 |
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| Net income per share: | | | | | | | | |
| Basic (in dollars per share) | $0.23 | $0.31 | $0.10 | $0.24 | $0.49 | $0.80 | $0.27 | $0.55 |
| Diluted (in dollars per share) | $0.23 | $0.31 | $0.09 | $0.23 | $0.47 | $0.78 | $0.28 | $0.54 |
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| Shares used in computing net income per share: | | | | | | | | |
| Basic (in shares) | 59.6 | 58.6 | 57.6 | 57.9 | 57.6 | 56.6 | 55.5 | 55.9 |
| Diluted (in shares) | 60.1 | 59.7 | 59.5 | 60.1 | 59.4 | 58.2 | 56.0 | 56.2 |
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