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Stockholders' Equity (Details) (USD $) | 9 Months Ended
--- | ---
Apr. 30, 2012 | Apr. 30, 2011
Treasury Stock, Shares, Acquired | 6,054,022 | 2,365,870
Treasury Stock, Value, Acquired, Cost Method | $ 188,061,000 | $ 68,071,000
Average price per share of shares repurchased on the open market | $ 31.06 | $ 28.77
Payment of accrued repurchases of common stock | 2,001,000 |
Amount at period end that remains to be expended under the current board repurchase authorization | 40,560,000 |
Targeted annual dividend per share, prior | $ 1.00 |
Targeted annual dividend per share | $ 1.10 | $ 1.00
Dividend Declared - First [Member] |  |
Dividends Payable, Date Declared, Day, Month and Year | Sep. 27, 2011 |
Quarterly dividend payment amount per share | $ 0.275 |
Dividends Payable, Date to be Paid | Nov. 22, 2011 |
Dividend Declared - Second [Member] |  |
Dividends Payable, Date Declared, Day, Month and Year | Dec. 08, 2011 |
Quarterly dividend payment amount per share | $ 0.275 |
Dividends Payable, Date to be Paid | Feb. 22, 2012 |
Dividend Declared - Third [Member] |  |
Dividends Payable, Date Declared, Day, Month and Year | Mar. 08, 2012 |
Quarterly dividend payment amount per share | $ 0.275 |
Dividends Payable, Date to be Paid | May 22, 2012 |
First stock repurchase program [Member] |  |
Maximum amount authorized by the board of directors for the repurchase of shares of the company's common stock |  | 100,000,000
Second stock repurchase program [Member] |  |
Maximum amount authorized by the board of directors for the repurchase of shares of the company's common stock | $ 250,000,000 |
Dividend Declared, Subsequent Event [Member] |  |
Dividends Payable, Date Declared, Day, Month and Year | Jun. 07, 2012 |
Quarterly dividend payment amount per share | $ 0.275 |
Dividends Payable, Date to be Paid | Aug. 20, 2012 |

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