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Exhibit 12
CALCULATION OF RATIO OF EARNINGS TO FIXED CHARGES
(IN THOUSANDS)
<Table>
<Caption>
SIX MONTHS ENDED
YEARS ENDED JULY 31, JANUARY 31,
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2003
1999 2000 2001 2002 RESTATED 2003 2004
-------- --------- -------- -------- -------- ---------- ----------
EARNINGS
Income before cumulative
effect of change in
accounting principle $ 61,271 $ 60,507 $ 34,206 $ 12,878 $ 12,392 $ 4,555 $ 2,691
Income tax provision 29,745 35,536 20,091 6,343 2,635 2,144 1,594
--------- --------- --------- --------- --------- --------- ---------
Earnings 91,016 96,043 54,297 19,221 15,027 6,699 4,285
--------- --------- --------- --------- --------- --------- ---------
FIXED CHARGES
Interest expense 1,772 21,169 22,195 16,255 27,985 11,576 19,424
Portion of rental expense
representative of
interest factor 705 1,113 2,082 3,030 3,034 1,327 1,651
--------- --------- --------- --------- --------- --------- ---------
Fixed charges 2,477 22,282 24,277 19,285 31,019 12,903 21,075
--------- --------- --------- --------- --------- --------- ---------
CAPITALIZED INTEREST -- (580) -- -- -- -- --
--------- --------- --------- --------- --------- --------- ---------
EARNINGS BEFORE INCOME TAX
PROVISION AND FIXED CHARGES $ 93,493 $ 117,745 $ 78,574 $ 38,506 $ 46,046 $ 19,602 $ 25,360
========= ========= ========= ========= ========= ========= =========
RATIO OF EARNINGS TO FIXED
CHARGES 37.7x 5.3x 3.2x 2.0x 1.5x 1.5x 1.2x
========= ========= ========= ========= ========= ========= =========