<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED BALANCE SHEETS AS OF MARCH 31, 2000 AND THE CONDENSED STATEMENTS OF
OPERATIONS FOR THE TWELVE MONTHS ENDED MARCH 31, 2000 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          MAR-31-2000
<PERIOD-START>                             APR-01-1999
<PERIOD-END>                               MAR-31-2000
<CASH>                                          28,956
<SECURITIES>                                    33,755
<RECEIVABLES>                                   61,163
<ALLOWANCES>                                       501
<INVENTORY>                                     38,389
<CURRENT-ASSETS>                               169,849
<PP&E>                                         181,545
<DEPRECIATION>                                  21,702
<TOTAL-ASSETS>                                 344,612
<CURRENT-LIABILITIES>                           27,540
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       229,275
<OTHER-SE>                                      73,878
<TOTAL-LIABILITY-AND-EQUITY>                   344,612
<SALES>                                        288,960
<TOTAL-REVENUES>                               288,960
<CGS>                                          152,746
<TOTAL-COSTS>                                  215,766
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,400
<INCOME-PRETAX>                                 77,068
<INCOME-TAX>                                    26,974
<INCOME-CONTINUING>                             50,094
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    50,094
<EPS-BASIC>                                       0.63
<EPS-DILUTED>                                     0.58