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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 15, 2015 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Common stock purchased, shares | 1,000,000 |  |  |
Common stock price per share | $ 60.00 |  |  |
Aggregate purchase price of common stock | $ 60,000,000 |  | $ 60,000,000 |
Closing price of common stock | $ 61.29 |  |  |
Percentage of issued and outstanding common stock prior to repurchase | 1.90% |  |  |
Option expiration from the date of grant, in years |  | 10 years |  |
Options granted during the period |  | 0 | 0 | 0
Cash received from stock option exercises |  | $ 0 | $ 141,000 | $ 3,206,000
Total intrinsic value of stock options exercised |  | 0 | $ 168,000 | $ 2,597,000
Stock option exercised |  |  | 5,000 | 101,313
Stock option value exercised |  |  | $ 141,000 | $ 3,206,000
Total unrecognized compensation costs |  | $ 11,077,000 |  |
Period for recognition of compensation cost not yet recognized |  | 2 years 5 months 5 days |  |
Stock-based compensation |  | $ 9,387,000 | 6,776,000 | 5,231,000
Tax benefits from stock compensation expense |  | 3,473,000 | 2,507,000 | 1,925,000
Discontinued Operations |  |  |  |
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Total compensation expenses |  | $ 0 | 0 | 480,000
Minimum |  |  |  |
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  | 3 years |  |
Maximum |  |  |  |
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  | 5 years |  |
Stock Option Awards |  |  |  |
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Total compensation expenses |  | $ 0 | 0 | 0
Restricted Stock Awards |  |  |  |
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  | 5 years |  |
Total compensation expenses |  | $ 115,000 | 115,000 | 91,000
Total unrecognized compensation costs |  | $ 101,000 |  |
Period for recognition of compensation cost not yet recognized |  | 11 months 23 days |  |
2010 Equity Incentive Plan |  |  |  |
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Number of shares authorized under stock option plan |  | 2,000,000 |  |
Number of shares available to be granted |  | 1,211,385 |  |
2006 Equity Incentive Plan |  |  |  |
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Number of shares authorized under stock option plan |  | 1,100,000 |  |
Number of shares available to be granted |  | 30,000 |  |
Restricted Stock Units (RSUs) |  |  |  |
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Total compensation expenses |  | $ 9,272,000 | $ 6,661,000 | $ 5,140,000

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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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: 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 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 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: 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 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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