<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED>
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   12-MOS                     12-MOS          
<FISCAL-YEAR-END>                          MAR-31-1998             MAR-31-1997             MAR-31-1996
<PERIOD-START>                             APR-01-1997             APR-01-1996             APR-01-1995
<PERIOD-END>                               MAR-31-1998             MAR-31-1997             MAR-31-1996
<CASH>                                         126,229                 244,856                 104,672
<SECURITIES>                                   163,241                  82,539                  62,951
<RECEIVABLES>                                   75,017                  67,044                  44,780
<ALLOWANCES>                                     3,638                   4,001                   2,124
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                               379,934                 406,413                 216,925
<PP&E>                                          81,659                  57,708                  41,346
<DEPRECIATION>                                  43,671                  31,443                  26,785
<TOTAL-ASSETS>                                 445,205                 456,740                 236,213
<CURRENT-LIABILITIES>                          151,537                 123,439                  71,542
<BONDS>                                            172                   1,741                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                           890                     845                     754
<OTHER-SE>                                     286,286                 329,264                 161,728
<TOTAL-LIABILITY-AND-EQUITY>                   445,205                 456,740                 236,213
<SALES>                                        184,953                 185,133                 126,876
<TOTAL-REVENUES>                               310,670                 277,868                 188,137
<CGS>                                           19,709                  11,777                   9,735
<TOTAL-COSTS>                                   63,065                  50,082                  36,514
<OTHER-EXPENSES>                               293,120                 282,163                 156,578
<LOSS-PROVISION>                                   664                   3,310                   1,653
<INTEREST-EXPENSE>                            (16,689)                (11,586)                 (4,234)
<INCOME-PRETAX>                               (28,826)                (42,791)                   (721)
<INCOME-TAX>                                     9,447                   6,820                   7,115
<INCOME-CONTINUING>                           (38,273)                (49,611)                 (7,836)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                  (38,273)                (49,611)                 (7,836)
<EPS-PRIMARY>                                  ($0.44)                 ($0.62)                 ($0.11)
<EPS-DILUTED>                                  ($0.44)                 ($0.62)                 ($0.11)
        

</TABLE>