<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
<CURRENCY> US DOLLARS
       
<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          MAY-31-1997             MAY-31-1998             MAY-31-1998             MAY-31-1998
<PERIOD-START>                             JUN-01-1996             JUN-01-1997             JUN-01-1997             JUN-01-1997
<PERIOD-END>                               MAY-31-1997             AUG-31-1997             NOV-30-1997             FEB-28-1998
<EXCHANGE-RATE>                                      1                       1                       1                       1
<CASH>                                          51,971                  26,584                  26,247                  59,261
<SECURITIES>                                         7                       7                       7                       7
<RECEIVABLES>                                  115,569                 125,355                 125,581                 128,272
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                     92,332                 113,244                 116,667                 140,341
<CURRENT-ASSETS>                               277,751                 277,948                 279,904                 335,610
<PP&E>                                         422,388                 439,096                 447,781                 456,393
<DEPRECIATION>                                 268,651                 277,019                 282,648                 287,679
<TOTAL-ASSETS>                                 454,371                 462,691                 467,201                 528,737
<CURRENT-LIABILITIES>                          111,546                 108,155                  99,728                  98,386
<BONDS>                                         96,154                  96,154                  96,154                 161,429
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                        37,053                  37,053                  37,053                  37,053
<OTHER-SE>                                     127,345                 143,588                 157,781                 156,766
<TOTAL-LIABILITY-AND-EQUITY>                   454,371                 462,691                 467,201                 528,737
<SALES>                                        605,049                 179,016                 366,621                 547,497
<TOTAL-REVENUES>                               608,742                 180,009                 369,378                 551,142
<CGS>                                          511,108                 146,764                 304,185                 463,415
<TOTAL-COSTS>                                  511,108                 146,764                 304,185                 463,415
<OTHER-EXPENSES>                                     0                       0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                              10,822                   2,890                   5,682                   8,999
<INCOME-PRETAX>                                 24,343                  18,529                  37,117                  43,309
<INCOME-TAX>                                  (25,680)                   6,670                  11,922                  14,151
<INCOME-CONTINUING>                             50,023                  11,859                  25,195                  29,158
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                 (5,192)
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                    50,023                  11,859                  25,195                  23,966
<EPS-PRIMARY>                                     1.40                    0.33                    0.70                    0.66
<EPS-DILUTED>                                     1.35                    0.32                    0.67                    0.64
        

</TABLE>