
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE JULY 31,
1998 CONSOLIDATED BALANCE SHEET AND CONSOLIDATED STATEMENT OF OPERATIONS FOR THE
THREE-MONTH PERIOD ENDED JULY 31, 1998, AS RESTATED TO REFLECT ACQUISITIONS
ACCOUNTED FOR AS POOLINGS OF INTERESTS, AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS AND THE FOOTNOTES THERETO.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               JUL-31-1998
<CASH>                                           4,092
<SECURITIES>                                         0
<RECEIVABLES>                                   23,276
<ALLOWANCES>                                     1,429
<INVENTORY>                                        646
<CURRENT-ASSETS>                                33,879
<PP&E>                                         153,794
<DEPRECIATION>                                  51,413
<TOTAL-ASSETS>                                 232,006
<CURRENT-LIABILITIES>                           32,221
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           319
<OTHER-SE>                                     141,335
<TOTAL-LIABILITY-AND-EQUITY>                   232,006
<SALES>                                              0
<TOTAL-REVENUES>                                45,084
<CGS>                                                0
<TOTAL-COSTS>                                   27,336
<OTHER-EXPENSES>                                12,313
<LOSS-PROVISION>                                 1,431
<INTEREST-EXPENSE>                               1,896
<INCOME-PRETAX>                                  3,796
<INCOME-TAX>                                     1,675
<INCOME-CONTINUING>                              2,121
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,121
<EPS-BASIC>                                       0.16
<EPS-DILUTED>                                     0.15


</TABLE>
