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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jun. 19, 2018 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Total unrecognized compensation costs |  | $ 21,993,000 |  |
Period for recognition of compensation cost not yet recognized |  | 2 years 2 months 23 days |  |
Tax benefits from stock compensation expense |  | $ 4,930,000 | $ 4,625,000 | $ 3,473,000
Stock repurchase program authorized amount | $ 250,000,000 |  |  |
Stock repurchase program expiration date | Jun. 19, 2020 |  |  |
Obligation to repurchase common stock |  | 0 |  |
Restricted Stock Units (RSUs) |  |  |  |
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Total compensation expenses |  | $ 17,000,000 | 12,399,000 | 9,272,000
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 |  |
2016 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 |  | 1,669,452 |  |
Restricted Stock Awards |  |  |  |
Stock Based Compensation And Stockholders Equity [Line Items] |  |  |  |
Total compensation expenses |  | $ 0 | $ 101,000 | $ 115,000
Total unrecognized compensation costs |  | $ 0 |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  | 5 years |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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