| In millions, except per share items | Jan-31-22 | Jan-31-21 | Jan-31-20 | Jan-31-19 | Jan-31-18 | Jan-31-17 | Jan-31-16 | Jan-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| CASH FLOWS FROM OPERATING ACTIVITIES | | | | | | | | |
| Net income | 35.7 | 23.8 | -40.7 | 51.9 | 72.3 | 77.4 | 50.2 | 43.5 |
| |
| Adjustments to reconcile net income to net cash used in operating activities | | | | | | | | |
| Changes in accrued interest on investments | | | | | -1.1 | -0.7 | -0.1 | |
| Stock compensation expense | 3.5 | 2.9 | 2.1 | 1.6 | 4.7 | 2.3 | 2.4 | 2.0 |
| Depreciation | 3.4 | 3.7 | 3.5 | 3.4 | 2.8 | 2.0 | 0.8 | 0.6 |
| Lease expense | 3.4 | 1.8 | 1.0 | | | | | |
| Amortization of intangible assets | 0.9 | 0.9 | 1.1 | 1.0 | 1.0 | 1.2 | 0.5 | 0.2 |
| Deferred income tax expense | -0.2 | 7.6 | -6.6 | -2.1 | -0.1 | 1.2 | 3.4 | 0.9 |
| Other | 0.4 | 0.6 | 0.9 | -0.3 | -0.1 | 1.2 | -0.1 | |
| |
| Changes in operating assets and liabilities | | | | | | | | |
| Accounts receivable | -0.5 | 8.5 | -1.0 | -10.0 | -7.2 | 0.8 | -8.2 | -4.5 |
| Contract assets | 21.7 | 6.7 | 25.0 | -44.5 | -6.6 | | | |
| Accounts payable and accrued expenses | -5.7 | 31.4 | -3.3 | -60.2 | -6.2 | 59.5 | -12.2 | 22.6 |
| Net cash used in operating activities | 28.4 | 176.0 | 53.6 | -112.3 | -72.8 | 259.0 | -33.0 | 93.3 |
| |
| CASH FLOWS FROM INVESTING ACTIVITIES | | | | | | | | |
| Purchases of short-term investments | -90.0 | -100.0 | -195.0 | -191.0 | -542.5 | -595.0 | -252.0 | |
| Maturities of short-term investments | 90.0 | 170.0 | 166.0 | 370.0 | 587.5 | 354.0 | 138.0 | |
| Purchases of available-for-sale securities | | | | | | | | |
| Purchases of property, plant and equipment | -1.4 | -1.7 | -7.1 | -8.6 | -4.8 | -2.8 | -3.1 | -2.9 |
| Net cash provided by (used in) investing activities | -7.0 | 67.0 | -36.1 | 170.6 | 38.7 | -243.8 | -130.5 | -3.6 |
| |
| CASH FLOWS FROM FINANCING ACTIVITIES | | | | | | | | |
| Proceeds from the exercise of stock options | 1.4 | 1.6 | 1.6 | 0.1 | 3.2 | 15.9 | 1.7 | 5.4 |
| Net cash used in financing activities | -34.6 | -45.4 | -14.0 | -15.5 | -13.6 | -8.9 | -8.6 | -28.3 |
| EFFECTS OF EXCHANGE RATE CHANGES ON CASH | -3.0 | 1.7 | -0.5 | -0.6 | 2.7 | -0.1 | | |