| In millions, except per share items | Mar-31-18 | Dec-31-17 | Sep-30-17 | Jun-30-17 | Mar-31-17 | Dec-31-16 | Sep-30-16 | Jun-30-16 |
| | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Revenue | 67.1 | 81.8 | 85.7 | 80.4 | 75.4 | 81.8 | 88.5 | 83.1 |
| Revenue growth | -11.0% | 0.0% | -3.1% | -3.2% | -5.4% | 12.3% | 29.7% | 23.0% |
| Cost of revenue | 42.2 | 49.0 | 52.3 | 51.1 | 44.1 | 49.7 | 50.8 | 49.1 |
| Selling, general and administrative expenses | 24.3 | 23.7 | 22.5 | 23.1 | 21.7 | 24.0 | 23.6 | 25.9 |
| Operating income | 0.6 | -85.0 | 10.9 | 6.2 | 9.6 | 8.1 | 14.0 | 8.1 |
| Operating margin | 1.0% | -103.9% | 12.7% | 7.7% | 12.7% | 9.9% | 15.8% | 9.8% |
| Interest income | 0.3 | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 | 0.2 | 0.1 |
| Interest expense | 0.0 | -1.7 | -1.0 | -0.9 | -0.9 | -0.9 | -0.9 | -0.9 |
| Other income (expense), net | 0.5 | 0.2 | 0.7 | 1.1 | 0.2 | -1.4 | -0.5 | -0.8 |
| Total interest and other income (expense), net | 0.9 | -1.1 | 0.8 | 1.5 | -0.5 | -2.1 | -1.3 | -1.5 |
| Income before provision for income taxes | 1.5 | -86.2 | 11.0 | 6.6 | 9.0 | 6.0 | 12.8 | 6.6 |
| Provision for income taxes | 1.4 | 9.5 | 4.6 | 2.4 | 3.4 | 4.2 | 4.7 | 2.4 |
| Tax rate | 94.7% | | 42.1% | 36.4% | 37.3% | 71.0% | 36.4% | 37.0% |
| Net income | 0.1 | -95.7 | 6.4 | 4.2 | 5.7 | 1.7 | 8.1 | 4.2 |
| |
| Net income per share: | | | | | | | | |
| Basic (dollars per common share) | | ($1.95) | $0.13 | $0.09 | $0.12 | $0.04 | $0.16 | $0.08 |
| Diluted (dollars per common share) | | ($1.94) | $0.13 | $0.08 | $0.11 | $0.04 | $0.16 | $0.08 |
| |
| Weighted-average shares used in computing net income per share: | | | | | | | | |
| Basic (in shares) | 49.8 | 49.2 | 49.6 | 49.1 | 48.7 | 50.5 | 49.7 | 51.0 |
| Diluted (in shares) | 50.3 | 49.2 | 50.3 | 50.1 | 49.3 | 51.0 | 50.2 | 51.6 |
| |
| Cash dividend (in usd per share) | $0.05 | | | | | | | |