<ARTICLE> 5
<MULTIPLIER> 1,000

                                                  
<PERIOD-TYPE>                   6-MOS                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-2000             SEP-30-1999
<PERIOD-START>                             OCT-01-1999             OCT-01-1998
<PERIOD-END>                               MAR-31-2000             MAR-31-1999
<CASH>                                          33,359                  81,912
<SECURITIES>                                   911,628                 145,308
<RECEIVABLES>                                   94,779                  70,034
<ALLOWANCES>                                     6,485                   1,000
<INVENTORY>                                     33,509                  26,931
<CURRENT-ASSETS>                               836,364                 317,502
<PP&E>                                         162,087                 129,506
<DEPRECIATION>                                  62,043                  50,783
<TOTAL-ASSETS>                               1,793,073                 522,893
<CURRENT-LIABILITIES>                           40,050                  35,480
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                         1,642                   1,561
<OTHER-SE>                                     919,197                 380,035
<TOTAL-LIABILITY-AND-EQUITY>                 1,793,073                 522,893
<SALES>                                        189,390                 127,645
<TOTAL-REVENUES>                               189,390                 127,645
<CGS>                                           66,619                  48,234
<TOTAL-COSTS>                                  165,901                  88,344
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                               1,400                       0
<INCOME-PRETAX>                                 29,966                  44,500
<INCOME-TAX>                                    24,942                  14,428
<INCOME-CONTINUING>                              5,024                  30,122
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     5,024                  30,122
<EPS-BASIC>                                        .03                     .20
<EPS-DILUTED>                                      .03                     .18