| In millions, except per share items | Apr-30-15 | Apr-30-14 | Apr-30-13 | Apr-30-12 | Apr-30-11 | Apr-30-10 | Apr-30-09 | Apr-30-08 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 93.4 | 95.0 | 42.9 | 65.8 | 124.5 | 6.7 | -38.1 | 65.0 |
| Depreciation and amortization | 34.7 | 32.7 | 32.5 | 29.8 | 20.6 | 22.7 | 19.1 | 13.6 |
| Stock-based compensation | 34.1 | 35.0 | 33.5 | 27.3 | 19.8 | 23.5 | 26.3 | 27.8 |
| Tax benefit from stock-based compensation | -2.0 | -2.5 | -2.7 | -0.5 | -0.1 | | | -0.6 |
| Deferred taxes | | | | 2.9 | | | | |
| Change in working capital [+] | -106.4 | 72.3 | -173.6 | -110.2 | -43.8 | -14.1 | 10.7 | -62.3 |
| Accounts receivable | 21.4 | -6.0 | -58.7 | 34.8 | -68.4 | -30.3 | 61.4 | -39.7 |
| Inventories | -111.6 | 128.8 | -163.5 | -204.6 | 5.6 | -45.2 | -10.6 | -19.5 |
| Other current assets | 13.5 | 2.8 | 10.2 | 2.1 | 3.2 | -0.3 | | |
| Accounts payable | -21.7 | -47.2 | 29.9 | 58.2 | 18.7 | 51.9 | -36.7 | -6.8 |
| Accrued expenses | 9.0 | -1.1 | 5.3 | -2.4 | -0.2 | 2.4 | | |
| Income taxes | -17.0 | -4.9 | 3.2 | 1.6 | -2.7 | 7.4 | | |
| Other | | | | | | | -3.4 | 3.8 |
| Other operating activities | 21.4 | 5.3 | 6.8 | -6.7 | 16.3 | 9.5 | 27.3 | 24.0 |
| Cash from operations | 75.2 | 237.9 | -60.6 | 8.4 | 137.3 | 48.3 | 45.2 | 67.6 |
| |
| Capital expenditures [+] | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | -32.2 | -30.7 |
| Purchases of property and equipment | | | | | | | -32.2 | -30.7 |
| Sales of property and equipment | -11.3 | -14.8 | -35.3 | -24.2 | -10.3 | -13.5 | | |
| Purchases of intangible assets | | -12.3 | -20.6 | -6.5 | -63.5 | | | |
| Acquisitions | | -4.5 | | | | -5.1 | | |
| Purchases of short-term investments, net | -54.8 | -125.8 | 17.8 | 43.6 | 8.4 | -82.9 | -59.2 | -78.0 |
| Purchases of short-term investments | -356.5 | -228.2 | -309.3 | -187.3 | -161.9 | -135.0 | -59.2 | -78.0 |
| Sales of short-term investments | 301.7 | 102.4 | 327.2 | 230.9 | 170.2 | 52.1 | | |
| Other cash from investing | 0.3 | 19.4 | -9.0 | -26.0 | 0.7 | | 92.5 | 132.9 |
| Cash from investing | -65.8 | -138.0 | -47.1 | -13.0 | -64.7 | -101.5 | 1.1 | 24.2 |
| |
| Repurchase of common stock, net | | | | -100.0 | | | -12.9 | -86.2 |
| Option exercises | 13.4 | 13.7 | 7.8 | 19.6 | 76.2 | 15.9 | | |
| Other cash from financing | 24.9 | 21.6 | 15.2 | 35.3 | 148.2 | 45.2 | 7.2 | 20.9 |
| Cash from financing | 11.6 | 7.9 | 7.4 | -84.3 | 72.0 | 29.3 | -5.7 | -65.3 |
| |
| Free cash flow | 75.2 | 237.9 | -60.6 | 8.4 | 137.3 | 48.3 | 13.0 | 36.9 |
| Per share (diluted) | $1.26 | $4.24 | ($1.13) | $0.14 | $2.32 | $0.92 | $0.26 | $0.67 |
| |
| Cash paid for interest | 2.1 | 2.4 | 2.6 | 2.7 | 2.8 | 2.1 | | |