
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUL-31-2000
<PERIOD-START>                             AUG-01-1999
<PERIOD-END>                               JAN-31-2000
<CASH>                                     235,614,129
<SECURITIES>                                80,887,825
<RECEIVABLES>                              160,964,268
<ALLOWANCES>                                 9,856,967
<INVENTORY>                                          0
<CURRENT-ASSETS>                           533,680,655
<PP&E>                                     209,030,602
<DEPRECIATION>                              50,931,997
<TOTAL-ASSETS>                             814,480,732
<CURRENT-LIABILITIES>                      179,968,253
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       242,320
<OTHER-SE>                                 380,848,684
<TOTAL-LIABILITY-AND-EQUITY>               814,480,732
<SALES>                                    558,940,131
<TOTAL-REVENUES>                           558,940,131
<CGS>                                      450,983,160
<TOTAL-COSTS>                              571,643,040
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                             3,329,098
<INTEREST-EXPENSE>                           6,289,513
<INCOME-PRETAX>                            213,963,966
<INCOME-TAX>                                94,642,609
<INCOME-CONTINUING>                        127,434,004
<DISCONTINUED>                                       0
<EXTRAORDINARY>                              2,975,846
<CHANGES>                                            0
<NET-INCOME>                               124,458,158
<EPS-BASIC>                                       3.65
<EPS-DILUTED>                                     3.42


</TABLE>
