<ARTICLE> 5
<MULTIPLIER> 1,000
       
                                                                                            
<PERIOD-TYPE>                   12-MOS                   12-MOS                   6-MOS                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-1997             MAR-31-1996             MAR-31-1998             MAR-31-1998
<PERIOD-END>                               MAR-31-1997             MAR-31-1996             SEP-30-1997             JUN-30-1997
<CASH>                                          12,200                  14,700                   3,400                   7,600
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                  236,900                 285,200                 292,300                 291,000
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                    314,500                 329,700                 340,700                 318,000
<CURRENT-ASSETS>                                     0                       0                       0                       0
<PP&E>                                       1,136,500               1,007,100               1,195,200               1,161,600
<DEPRECIATION>                               (424,900)               (369,600)               (451,000)               (439,600)
<TOTAL-ASSETS>                               1,356,400               1,426,600               1,484,800               1,417,600
<CURRENT-LIABILITIES>                                0                       0                       0                       0
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                        43,000                  41,600                  43,200                  43,100
<OTHER-SE>                                     766,500                 704,400                 782,700                 792,700
<TOTAL-LIABILITY-AND-EQUITY>                 1,356,400               1,426,600               1,484,800               1,417,600
<SALES>                                              0                       0                       0                       0
<TOTAL-REVENUES>                             2,234,300               2,241,700               1,120,400                 560,100
<CGS>                                                0                       0                       0                       0
<TOTAL-COSTS>                                1,877,600               1,929,000                 917,600                 459,200
<OTHER-EXPENSES>                                     0                       0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                              21,400                  30,800                  10,200                   5,000
<INCOME-PRETAX>                                181,300                 165,800                  41,500                  52,600
<INCOME-TAX>                                    67,600                  64,500                  15,600                  19,400
<INCOME-CONTINUING>                            113,700                 101,300                  25,900                  33,200
<DISCONTINUED>                                  23,800                  12,500                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                   137,500                 113,800                  25,900                  33,200
<EPS-PRIMARY>                                     3.24                    2.75                    0.60                    0.77
<EPS-DILUTED>                                     3.21                    2.72                    0.59                    0.76