<ARTICLE> 5
<MULTIPLIER> 1,000
       
                                                                                            
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1996             OCT-31-1996             OCT-31-1996             OCT-31-1996
<PERIOD-END>                               JAN-31-1996             APR-30-1996             JUL-31-1996             OCT-31-1996
<CASH>                                         193,972                 245,318                 228,603                 246,964
<SECURITIES>                                   149,873                 137,710                 113,736                  69,378
<RECEIVABLES>                                  596,569                 590,279                 572,016                 742,547
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                    110,654                 117,377                  60,224                  73,927
<CURRENT-ASSETS>                             1,473,132               1,508,536               1,531,219               1,796,823
<PP&E>                                       2,158,580               2,288,739               2,397,254               2,498,874
<DEPRECIATION>                                 663,829                 717,391                 787,462                 821,212
<TOTAL-ASSETS>                               3,397,761               3,520,600               3,598,418               3,951,726
<CURRENT-LIABILITIES>                        1,351,773               1,425,344               1,402,995               1,645,568
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                        52,171                  52,231                  52,249                  52,369
<OTHER-SE>                                   1,431,739               1,487,179               1,547,191               1,617,357
<TOTAL-LIABILITY-AND-EQUITY>                 3,397,761               3,520,600               3,598,418               3,951,726
<SALES>                                              0                       0                       0                       0
<TOTAL-REVENUES>                             2,402,414               4,984,643               7,687,464              11,015,192
<CGS>                                                0                       0                       0                       0
<TOTAL-COSTS>                                2,303,342               4,780,517               6,982,851              10,565,449
<OTHER-EXPENSES>                                     0                       0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                               3,441                   6,916                  11,416                  16,051
<INCOME-PRETAX>                                 89,763                 186,845                 291,711                 413,218
<INCOME-TAX>                                    32,315                  65,697                 102,486                 145,134
<INCOME-CONTINUING>                             57,448                 121,148                 189,225                 268,084
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                    57,448                 121,148                 189,225                 268,084
<EPS-PRIMARY>                                     0.70                    1.47                    2.29                    3.24
<EPS-DILUTED>                                     0.69                    1.45                    2.27                    3.21