| In millions, except per share items | Mar-31-23 | Mar-31-22 | Mar-31-21 | Mar-31-20 | Mar-31-19 | Mar-31-18 | Mar-31-17 | Mar-31-16 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Cash flows from operating activities: | | | | | | | | |
| Net loss | 59.6 | 35.9 | 19.4 | -2.8 | -73.3 | 79.8 | 33.3 | -28.4 |
| Adjustments to reconcile net loss to cash from operating activities, net of the effects of acquisitions: | | | | | | | | |
| Depreciation and amortization | 85.9 | 95.8 | 105.8 | 116.1 | 137.9 | 153.5 | 160.9 | 140.1 |
| Operating lease right-of-use assets | 10.6 | 10.3 | 10.0 | 10.5 | | | | |
| Loss on disposal of fixed assets | 0.0 | 0.0 | 0.2 | 0.0 | 0.3 | 0.5 | 0.3 | 0.1 |
| Share-based compensation expense | 62.0 | 56.1 | 51.9 | 50.9 | 56.3 | 47.3 | 39.2 | 28.4 |
| Change in fair value of derivative investment | | | | | | | | |
| Deferred income taxes | -54.0 | -12.7 | -23.8 | -9.8 | -33.4 | -127.8 | -11.0 | -42.1 |
| Other losses | 0.0 | 0.0 | -0.2 | -0.2 | -0.2 | 0.0 | -0.1 | -0.3 |
| Changes in assets and liabilities | | | | | | | | |
| Accounts receivable and unbilled costs | 4.9 | 49.3 | 16.9 | 21.5 | -22.2 | 85.0 | -48.1 | -23.3 |
| Inventories | 9.0 | -8.0 | -2.0 | 1.5 | 5.3 | 1.0 | 12.5 | 5.5 |
| Prepaid expenses and other assets | 5.0 | -13.0 | 11.5 | 13.8 | 3.0 | 20.1 | -24.8 | -29.5 |
| Accounts payable | -5.5 | 4.2 | -1.7 | -4.3 | -3.9 | -8.9 | 0.4 | 2.3 |
| Accrued compensation and other expenses | 12.1 | 2.4 | 32.0 | 32.8 | 20.0 | -17.7 | 6.8 | 33.3 |
| Operating lease liabilities | -11.9 | -12.1 | -10.3 | -13.1 | | | | |
| Income taxes payable | 0.2 | -3.1 | 6.7 | -0.9 | -0.6 | -2.7 | 2.0 | 3.9 |
| Deferred revenue | -22.6 | 91.1 | -2.3 | 8.2 | 15.1 | -8.1 | 33.1 | |
| Net cash used in operating activities | 156.7 | 296.0 | 213.9 | 225.0 | 149.8 | 222.5 | 226.8 | 97.2 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Proceeds from sales and maturity of marketable securities | 140.5 | 20.6 | 56.8 | 144.3 | 230.4 | 196.0 | 181.3 | 118.9 |
| Purchase of fixed assets | -10.5 | -10.4 | -12.0 | -19.9 | -23.4 | -15.9 | -29.7 | -24.8 |
| Purchase of intangible assets | -0.2 | -0.1 | -4.5 | | | -0.5 | -1.0 | -4.0 |
| Net cash (used in) provided by investing activities | 15.3 | -68.4 | 24.7 | -4.3 | -26.3 | 57.1 | -41.6 | 25.1 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Issuance of common stock under stock plans | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| Treasury stock repurchases, including accelerated share repurchases | -150.0 | -35.7 | -3.3 | -175.0 | -14.5 | -501.3 | -80.0 | -302.8 |
| Tax withholding on restricted stock units | -19.4 | -15.7 | -13.3 | -11.9 | -12.0 | -13.6 | -9.6 | |
| Repayment of long-term debt | -250.0 | -350.0 | -100.0 | -100.0 | -50.0 | | | |
| Net cash used in financing activities | -419.4 | -54.2 | -118.3 | -286.9 | -79.3 | -221.0 | -89.6 | -17.2 |
| Effect of exchange rate changes on cash and cash equivalents | -1.9 | -4.5 | 6.6 | -3.4 | -5.2 | 6.4 | -0.8 | |
| |
| Supplemental disclosures: | | | | | | | | |
| Cash paid for interest | 8.1 | 5.0 | 7.7 | 17.6 | 23.3 | 9.6 | 6.4 | 3.8 |
| Cash paid for income taxes | 55.9 | 31.7 | 11.5 | 13.1 | 13.4 | 18.2 | 49.3 | 50.7 |
| Non-cash transactions: | | | | | | | | |
| Transfers of inventory to fixed assets | 1.4 | 2.7 | 1.5 | 2.3 | 2.2 | 5.6 | 4.9 | 1.2 |
| Additions to property, plant and equipment included in accounts payable | 0.1 | 0.2 | 0.3 | 0.3 | 0.5 | 1.4 | 1.2 | -1.1 |