| In millions, except per share items | Mar-31-16 | Mar-31-15 | Mar-31-14 | Mar-31-13 | Dec-31-12 | Sep-30-12 | Mar-31-12 | Dec-31-11 |
| | 10-K | 10-K | 10-K | 10-K | 8-K | 8-K | 10-K | 8-K |
| Net sales and contract revenues: | | | | | | | | |
| Net product sales and contract revenues | 54.2 | 76.0 | 121.3 | 98.5 | | | 114.1 | |
| Net service revenues | 48.8 | 50.8 | 69.0 | 88.2 | | | 89.4 | |
| Total net sales and contract revenues | 103.0 | 126.8 | 190.2 | 186.7 | 145.2 | 95.5 | 203.6 | 166.4 |
| Total net sales and contract revenues growth | -18.7% | -33.4% | 1.9% | -8.3% | -12.7% | -12.8% | -26.9% | |
| Cost of sales and contracts: | | | | | | | | |
| Cost of product sales and contracts | 31.8 | 44.1 | 77.0 | 68.2 | | | 65.5 | |
| Cost of service revenues | 24.9 | 25.4 | 36.6 | 39.0 | | | 44.9 | |
| Total cost of sales and contracts | 56.8 | 69.5 | 113.6 | 107.3 | | | 110.4 | |
| Gross profit | 46.2 | 57.3 | 76.7 | 79.4 | | | 93.1 | |
| Gross margin | 44.9% | 45.2% | 40.3% | 42.5% | | | 45.7% | |
| |
| Expenses: | | | | | | | | |
| Selling, general and administrative expenses | 29.8 | 32.7 | 31.8 | 29.5 | | | 35.6 | |
| Research and development costs | 21.7 | 23.4 | 22.1 | 23.6 | | | 25.5 | |
| Total operating expenses | 105.6 | 114.0 | 108.8 | 107.1 | | | 123.1 | |
| Operating income (loss) | -5.3 | 1.2 | 22.8 | 26.3 | | | 31.9 | |
| Operating margin | -5.2% | 0.9% | 12.0% | 14.1% | | | 15.7% | |
| |
| Other income (expense): | | | | | | | | |
| Interest and investment income | 0.2 | 0.3 | 0.4 | 0.7 | | | 0.7 | |
| Other expense, net | -0.4 | -0.4 | -0.3 | -0.4 | | | -0.1 | |
| Total other income (expense) | -0.5 | -0.5 | -0.4 | -0.2 | | | 0.5 | |
| Income (loss) before provision for (benefit from) income taxes | -5.5 | 1.0 | 22.7 | 26.4 | | | | |
| Provision for (benefit from) income taxes | -2.3 | 0.1 | 7.6 | 9.0 | | | 11.0 | |
| Net income (loss) | -3.2 | 1.0 | 15.1 | 17.5 | 16.7 | 10.6 | 21.4 | 20.1 |
| |
| Other comprehensive income (loss): | | | | | | | | |
| Unrealized gain on available for sale securities (net of tax) | 0.0 | 0.0 | 0.0 | 0.0 | | | 0.0 | |
| Comprehensive income (loss) | -3.2 | 1.0 | 15.1 | 17.4 | | | 21.4 | |
| |
| Income (loss) per share - Basic (in dollars per share) | ($0.45) | $0.13 | $1.92 | $2.08 | | | $2.37 | |
| Income (loss) per share - Diluted (in dollars per share) | ($0.45) | $0.13 | $1.91 | $2.07 | | | $2.34 | |
| |
| Weighted average shares - Basic (in shares) | 7.2 | 7.7 | 7.8 | 8.4 | | | 9.0 | |
| Weighted average shares - Diluted (in shares) | 7.2 | 7.7 | 7.9 | 8.4 | | | 9.1 | |