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Earnings Per Share (Tables) | 9 Months Ended
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Apr. 30, 2012
Earnings Per Share [Abstract] |
Schedule of numerators and denominators used in basic and diluted EPS calculations |
|  | Three months ended April 30, |  | Nine months ended April 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
Numerator: |  |  |  |  |  |  |  |
Net income for basic calculation |  | $ 6,066,000 |  | 14,255,000 |  | 24,488,000 |  | 56,007,000
Effect of dilutive securities: |  |  |  |  |  |  |  |
Interest expense (net of tax) on 3.0% convertible senior notes |  | 1,117,000 |  | 1,117,000 |  | 3,351,000 |  | 3,351,000
Numerator for diluted calculation |  | $ 7,183,000 |  | 15,372,000 |  | 27,839,000 |  | 59,358,000
Denominator: |  |  |  |  |  |  |  |
Denominator for basic calculation |  | 18,853,000 |  | 26,577,000 |  | 20,746,000 |  | 27,310,000
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options |  | 263,000 |  | 210,000 |  | 236,000 |  | 219,000
Conversion of 3.0% convertible senior notes |  | 5,794,000 |  | 5,591,000 |  | 5,742,000 |  | 5,540,000
Denominator for diluted calculation |  | 24,910,000 |  | 32,378,000 |  | 26,724,000 |  | 33,069,000

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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