|
Earnings Per Share (Details) (USD $)
|
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Apr. 30, 2011
|
Apr. 30, 2010
|
Apr. 30, 2011
|
Apr. 30, 2010
|
|
| Earnings Per Share | Â | Â | Â | Â |
| Antidilutive equity-classified stock-based awards not included in calculation of earnings per share (in shares) | 2,342,000 | 2,019,000 | 2,424,000 | 2,042,000 |
| Net income for basic calculation | $ 14,255,000 | $ 21,796,000 | $ 56,007,000 | $ 47,161,000 |
| 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 | $ 15,372,000 | $ 22,913,000 | $ 59,358,000 | $ 50,512,000 |
| Denominator for basic calculation | 26,577,000 | 28,291,000 | 27,310,000 | 28,254,000 |
| Dilutive effect on shares of stock options | 210,000 | 307,000 | 219,000 | 332,000 |
| Dilutive effect on shares of conversion of 3.0% convertible senior notes | 5,591,000 | 5,488,000 | 5,540,000 | 5,488,000 |
| Denominator for diluted calculation | 32,378,000 | 34,086,000 | 33,069,000 | 34,074,000 |