<ARTICLE> 5
<LEGEND>
RESTATED - SEE NOTE 12 TO THE UNAUDITED CONDENSED CONSOLIDATED FINANCIAL
STATEMENTS.


<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          SEP-30-2000
<PERIOD-START>                             OCT-01-1999
<PERIOD-END>                               JUN-30-2000
<CASH>                                          88,699
<SECURITIES>                                   276,671
<RECEIVABLES>                                  102,193
<ALLOWANCES>                                     2,503
<INVENTORY>                                     25,006
<CURRENT-ASSETS>                               232,252
<PP&E>                                       1,493,943
<DEPRECIATION>                                 823,802
<TOTAL-ASSETS>                               1,196,975
<CURRENT-LIABILITIES>                           65,720
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         5,353
<OTHER-SE>                                     909,848
<TOTAL-LIABILITY-AND-EQUITY>                 1,196,975
<SALES>                                        425,195
<TOTAL-REVENUES>                               453,397
<CGS>                                          340,398
<TOTAL-COSTS>                                  340,398
<OTHER-EXPENSES>                                 6,586
<LOSS-PROVISION>                                 (300)
<INTEREST-EXPENSE>                               2,389
<INCOME-PRETAX>                                 95,703
<INCOME-TAX>                                    39,790
<INCOME-CONTINUING>                             58,291
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    58,291
<EPS-BASIC>                                       1.18
<EPS-DILUTED>                                     1.17