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Net Income Per Share (Details) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014 | Jan. 31, 2013
Earnings Per Share [Abstract] |  |  |  |
Basic weighted average shares outstanding | 125,564 | 124,709 | 125,512 | 124,505
Effect of dilutive securities - stock options | 5,537 | 4,811 | 5,392 | 4,492
Diluted weighted average shares outstanding | 131,101 | 129,520 | 130,904 | 128,997

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