<ARTICLE> 5 <LEGEND> This schedule contains summary financial information extracted from the Balance Sheet and Statement of Operations included in the Company's Form 10-K for the year ended March 31, 1998 and is qualified in its entirety by reference to such Financial Statements. </LEGEND> <MULTIPLIER> 1,000 <FISCAL-YEAR-END> Mar-31-1998 Mar-31-1997 <PERIOD-START> Apr-01-1997 Apr-01-1996 <PERIOD-END> Mar-31-1998 Mar-31-1997 <PERIOD-TYPE> 12-MOS 12-MOS <CASH> 24,985 44,225 <SECURITIES> 0 10,833 <RECEIVABLES> 71,343 36,826 <ALLOWANCES> 1,327 1,055 <INVENTORY> 18,400 11,837 <CURRENT-ASSETS> 126,923 109,695 <PP&E> 382,875 231,888 <DEPRECIATION> 92,392 53,013 <TOTAL-ASSETS> 478,223 373,389 <CURRENT-LIABILITIES> 38,224 37,868 <BONDS> 230,000 230,000 <PREFERRED-MANDATORY> 0 0 <PREFERRED> 0 0 <COMMON> 43 41 <OTHER-SE> 182,409 95,401 <TOTAL-LIABILITY-AND-EQUITY> 478,223 373,389 <SALES> 356,194 263,209 <TOTAL-REVENUES> 356,194 263,209 <CGS> 225,599 156,277 <TOTAL-COSTS> 225,599 156,277 <OTHER-EXPENSES> 22,504 17,615 <LOSS-PROVISION> 0 0 <INTEREST-EXPENSE> 8,194 3,329 <INCOME-PRETAX> 99,897 85,988 <INCOME-TAX> 29,969 25,400 <INCOME-CONTINUING> 69,928 60,588 <DISCONTINUED> 0 0 <EXTRAORDINARY> 0 0 <CHANGES> 0 0 <NET-INCOME> 69,928 61,745 <EPS-PRIMARY> $1.66 $1.52 <EPS-DILUTED> $1.40 $1.35