Exhibit 12.1

RATIO OF EARNINGS TO FIXED CHARGES

	Year Ended May 31,
	2010		2009		2008		2007		2006
	($ in thousands)
Income before income taxes	$103,536		$44,398		$40,154		$6,014		$20,055
Plus fixed charges:
Interest expense	1,481		1,692		296		272		184
Debt cost amortization	512		470		0		0		0
Portion of rents representative of an appropriate interest factor	3,439		3,295		2,990		3,379		3,007
Total fixed charges (1)	$5,432		$5,457		$3,286		$3,651		$3,191
Adjusted earnings (2)	$108,968		$49,855		$43,440		$9,665		$23,246
Ratio (2 divided by 1)	20.1		9.1		13.2		2.6		7.3
Fixed charges deficiency	$0		$0		$0		$0		$0
Rent Expense	$10,328		$9,895		$8,980		$10,148		$9,031
Interest Factor at 33.3%	33.3	%	33.3	%	33.3	%	33.3	%	33.3	%
Portion of rents representative of an appropriate interest factor	$3,439		$3,295		$2,990		$3,379		$3,007