| Years ended March 31, | |||
| 1996 | 1995 | 1994 | |
| Increase (decrease) in Cash and Cash Equivalents | |||
| Cash flows from operating activities: | |||
| Net income | $101,454 | $ 59,278 | $ 41,279 |
| Adjustments to reconcile net income to net cash provided by operating activities: | |||
| Write-off of in-process technology | 19,366 | --- | --- |
| Depreciation and amortization | 22,464 | 12,241 | 10,811 |
| Changes in assets and liabilities net of effects of NeoCAD acquisition: | |||
| Accounts receivable | (34,777) | (7,959) | (8,813) |
| Inventories, including the impact of receipts against | |||
| advances for wafer purchases | 19,375 | 1,011 | (13,536) |
| Deferred income taxes and other | (783) | (1,685) | (2,293) |
| Accounts payable, accrued liabilities and income taxes payable | 7,408 | 21,959 | 10,352 |
| Deferred income on shipments to distributors | 15,755 | 3,153 | 5,389 |
| Total adjustments net of effects of NeoCAD acquisition | 48,808 | 28,720 | 1,910 |
| Net cash provided by operating activities | 150,262 | 87,998 | 43,189 |
| Cash flows from investing activities: | |||
| Purchases of short-term available-for-sale investments | (292,013) | (75,590) | (38,212) |
| Proceeds from maturity of short-term available-for-sale investments | 92,333 | 77,193 | 24,717 |
| Purchases of held-to-maturity investments | (96,141) | (362,625) | --- |
| Proceeds from maturity of held-to-maturity investments | 72,555 | 350,000 | --- |
| Advances for wafer purchases | --- | (42,000) | --- |
| Acquisition of NeoCAD, net of cash acquired | (33,412) | --- | --- |
| Acquisition of property, plant and equipment | (60,506) | (26,227) | (12,334) |
| Investment in joint venture | (34,316) | --- | --- |
| Other | (1,235) | (6,647) | (3,815) |
| Net cash used in investing activities | (352,735) | (85,896) | (29,644) |
| Cash flows from financing activities: | |||
| Net proceeds from issuance of long-term debt | 243,901 | --- | --- |
| Principal payments on capital lease obligations | (1,389) | (1,421) | (2,063) |
| Proceeds from issuance of common stock | 14,151 | 8,688 | 5,883 |
| Net cash provided by financing activities | 256,663 | 7,267 | 3,820 |
| Net increase in cash and cash equivalents | 54,190 | 9,369 | 17,365 |
| Cash and cash equivalents at beginning of period | 56,703 | 47,334 | 29,969 |
| Cash and cash equivalents at end of period | $110,893 | $ 56,703 | $ 47,334 |
| Schedule of non-cash transactions: | |||
| Tax benefit from stock options | $ 7,907 | $ 3,456 | $ 2,417 |
| Issuance of treasury stock under employee stock plans | $ 8,223 | $ 9,195 | --- |
| Receipts against advances for wafer purchases | $ 32,966 | --- | --- |
| Supplemental disclosures of cash flow information: | |||
| Interest paid relating to capital lease obligations | $ 201 | $ 549 | $ 535 |
| Interest paid relating to reverse repurchase agreements | $ --- | $ 9,737 | --- |
| Income taxes paid | $ 74,688 | $ 34,730 | $ 24,587 |
| See accompanying notes. | |||