| In millions, except per share items | Apr-30-22 | Apr-30-21 | Apr-30-20 | Apr-30-19 | Apr-30-18 | Apr-30-17 | Apr-30-16 | Apr-30-15 |
| Revenues | 62.5 | 40.1 | 18.8 | 12.8 | 8.9 | 42.4 | 41.7 | 49.8 |
| Revenue growth | 55.9% | 113.3% | 47.3% | 42.9% | -78.9% | 1.7% | -16.3% | -19.9% |
| Cost of goods sold | 35.8 | 25.6 | 13.8 | 10.8 | 6.1 | 41.2 | 1.5 | 1.4 |
| Gross profit | 26.7 | 14.5 | 5.0 | 2.0 | 2.9 | 1.1 | 40.1 | 48.4 |
| Gross margin | 42.7% | 36.1% | 26.6% | 15.5% | 32.1% | 2.7% | 96.3% | 97.2% |
| Selling, general and administrative | | | | 5.2 | 5.7 | 0.2 | 55.6 | 2.6 |
| General and administrative | 5.4 | 5.4 | 13.0 | | | | | |
| EBITA | 21.3 | 9.0 | -5.0 | -3.2 | -2.8 | 1.5 | -2.3 | -0.5 |
| EBITA margin | 34.1% | 22.6% | -26.8% | -25.3% | -31.8% | 3.5% | -5.4% | -1.0% |
| Amortization of intangibles | | | | | | 0.0 | 1.4 | 1.5 |
| EBIT | 21.3 | 9.0 | -5.0 | -3.2 | -2.8 | 1.5 | -3.7 | -2.0 |
| EBIT margin | 34.1% | 22.6% | -26.8% | -25.3% | -31.8% | 3.5% | -8.8% | -4.0% |
| Pre-tax income | 21.6 | 10.0 | -7.6 | -3.2 | -2.8 | 1.0 | -15.4 | -5.7 |
| Income taxes | 5.7 | 2.6 | -1.7 | -0.7 | -0.3 | 1.0 | -5.2 | -2.1 |
| Tax rate | 26.4% | 26.3% | 22.6% | 22.3% | 9.8% | 101.5% | 33.8% | 37.3% |
| Earnings from continuing ops | 15.9 | 7.4 | -5.9 | -6.5 | -5.4 | 0.0 | -10.2 | -18.5 |
| Earnings from discontinued ops | | | | 4.0 | 2.8 | | | 14.9 |
| Net income | 15.9 | 7.4 | -5.9 | -2.5 | -2.6 | 0.0 | -10.2 | -3.6 |
| Net margin | 25.4% | 18.4% | -31.4% | -19.3% | -28.7% | 0.0% | -24.5% | -7.2% |
| |
| Diluted EPS | $2.21 | $0.95 | ($0.73) | ($0.79) | ($0.66) | $0.00 | ($1.27) | ($2.33) |
| Shares outstanding (diluted) | 7.2 | 7.8 | 8.1 | 8.1 | 8.1 | 8.1 | 8.1 | 7.9 |
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| EBIT is a non-GAAP figure that excludes all non-recurring expenses: restructuring costs, asset impairments, IPR&D writeoffs, and other unusual charges. |