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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014 Regular Dividend | Oct. 31, 2013 Regular Dividend | Jan. 31, 2014 Regular Dividend | Nov. 30, 2013 Special Dividend | Jan. 31, 2014 Restricted Stock Units (RSUs) | Jan. 31, 2013 Restricted Stock Units (RSUs) | Jan. 31, 2014 Restricted Stock Units (RSUs) Discontinued Operations | Jan. 31, 2013 Restricted Stock Units (RSUs) Discontinued Operations
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Total compensation expenses |  |  |  |  |  |  | $ 2,648 | $ 1,312 | $ 480 | $ 104
Payments related to vesting of stock-based awards | 1,251 |  |  |  |  |  |  |  |  |
Dividends declared and paid per common share |  |  | $ 0.23 | $ 0.23 |  | $ 1.00 |  |  |  |
Cash dividends | $ 24,510 | $ 19,069 |  |  | $ 77,800 | $ 53,290 |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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