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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2014 Regular Dividend | Jan. 31, 2014 Regular Dividend | Oct. 31, 2013 Regular Dividend | Apr. 30, 2014 Regular Dividend | Nov. 30, 2013 Special Dividend | Apr. 30, 2014 Restricted Stock Units (RSUs) | Apr. 30, 2013 Restricted Stock Units (RSUs) | Apr. 30, 2014 Restricted Stock Units (RSUs) Discontinued Operations | Apr. 30, 2013 Restricted Stock Units (RSUs) Discontinued Operations
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total compensation expenses |  |  |  |  |  |  |  | $ 3,943 | $ 2,051 | $ 480 | $ 156
Payments related to vesting of stock-based awards | 1,251 |  |  |  |  |  |  |  |  |  |
Dividends declared and paid per common share |  |  | $ 0.23 | $ 0.23 | $ 0.23 |  | $ 1.00 |  |  |  |
Cash dividends |  |  |  |  |  | 90,057 |  |  |  |  |
Regular cash dividends paid | 36,767 | 28,614 |  |  |  |  |  |  |  |  |
Special cash dividends paid | $ 53,290 | $ 79,525 |  |  |  |  | $ 53,290 |  |  |  |

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