| In millions, except per share items | Jan-31-16 | Jan-31-15 | Jan-31-14 | Jan-31-13 | Jan-31-12 | Jan-31-11 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | S-1/A |
| Net income | -99.1 | -108.9 | -149.8 | -109.1 | -44.8 | -16.7 |
| Depreciation and amortization | 8.7 | 11.0 | 12.6 | 9.0 | 5.1 | |
| Stock-based compensation | 21.4 | 23.0 | 36.4 | 17.9 | 1.0 | |
| Change in working capital [+] | -12.3 | -13.1 | 7.1 | 3.4 | -17.2 | |
| Accounts receivable | 9.8 | 6.0 | 1.0 | -6.4 | -15.1 | |
| Inventories | -1.6 | 9.1 | -24.3 | -6.5 | -21.1 | |
| Accounts payable | -7.8 | -11.8 | 2.9 | -1.9 | 9.2 | |
| Accrued expenses | -5.9 | -17.1 | 15.4 | 7.5 | 8.4 | |
| Deferred revenues | -6.8 | 0.8 | 12.2 | 10.7 | 1.4 | |
| Other operating activities | 2.8 | 8.5 | 12.2 | 1.8 | 5.8 | |
| Cash from operations | -78.6 | -79.5 | -81.5 | -76.9 | -50.0 | |
| |
| Capital expenditures | -6.9 | -11.7 | -9.3 | -10.6 | -5.0 | |
| Purchases of property and equipment | -6.9 | -11.7 | -9.3 | -10.6 | -5.0 | |
| Purchases of short-term investments, net | 16.9 | -1.4 | -59.1 | | | |
| Purchases of short-term investments | -52.4 | -57.4 | -66.2 | | | |
| Sales of short-term investments | 69.3 | 56.0 | 7.1 | | | |
| Other cash from investing | -5.8 | 20.7 | -0.6 | -5.0 | | |
| Cash from investing | 4.2 | 7.6 | -69.0 | -15.5 | -5.0 | |
| |
| Issuance of common stock, net | | 0.9 | 147.5 | -2.1 | 0.0 | |
| Option exercises | 1.2 | 3.2 | 0.6 | 0.3 | 0.4 | |
| Other cash from financing | 5.9 | 127.2 | 26.6 | 89.5 | 72.0 | |
| Cash from financing | 4.6 | 125.0 | 173.4 | 87.2 | 71.6 | |
| |
| Free cash flow | -85.5 | -91.2 | -90.8 | -87.5 | -55.1 | |
| Per share (diluted) | ($0.88) | ($1.00) | ($2.34) | ($6.42) | ($3.71) | |
| |
| Cash paid for interest | 5.2 | 0.4 | 1.0 | | | |