Earnings Per Share (Tables)

3 Months Ended

Oct. 31, 2011

Earnings Per Share [Abstract]

Schedule of numerators and denominators used in basic and diluted EPS calculations

	Three months ended October 31,
	2011	2010
Numerator:
Net income for basic calculation	$   12,601,000	25,656,000
Effect of dilutive securities:
Interest expense (net of tax) on 3.0% convertible senior notes	1,117,000	1,117,000
Numerator for diluted calculation	$   13,718,000	26,773,000
Denominator:
Denominator for basic calculation	23,257,000	28,119,000
Effect of dilutive securities:
Stock options	198,000	159,000
Conversion of 3.0% convertible senior notes	5,692,000	5,493,000
Denominator for diluted calculation	29,147,000	33,771,000