Stockholder's Investments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncumulative Cash Dividend	$ 0.01665
Annual Amount Entitled to be Received by Class A Common Stock shareholders	$ 0.835
Class A Nonvoting Common Stock Shares Reserved for Outstanding Share-Based Awards	4,487,690
Number of Shares Remaining for Future Issuance of Share-Based Awards	3,455,115
Share-based Compensation Expense	$ 9,495	$ 8,154	$ 4,471
Share-based Compensation Expense, Net of Tax	5,887	$ 5,056	2,772
Share-Based Compensation Cost Not yet Recognized	$ 13,054
Share-Based Compensation Cost Not yet Recognized, Period for Recognition	1 year 10 months 2 days
Restricted Shares and RSUs, Grants in Period, Weighted Average Grant Date Fair Value		$ 20.07
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.33%
Options, Award Vesting Period	3 years
Options, Expiration Period	10 years
Options, Vested in Period, Fair Value	$ 2,911	$ 3,203	3,950
Options, Exercised in Period, Aggregate Intrinsic Value	$ 7,901	$ 811	$ 208
Options Exercisable, Number	1,859,959	2,488,527	2,642,955
Options Exercisable, Weighted Average Exercise Price	$ 28.20	$ 30.18	$ 30.88
Options, Exercised in Period, Proceeds from Issuance of Shares	$ 19,728	$ 5,246	$ 1,644
Options, Exercised in Period, Tax Benefit	3,002	$ 308	$ 79
Options Outstanding, Aggregate Intrinsic Value	18,442
Options Exercisable, Aggregate Intrinsic Value	$ 10,144
Service-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Award Vesting Period	3 years

Amount entitled to receive due to cumulative preferred stock holders.

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Noncumulative cash dividend.

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Share based compensation arrangement by share based payment award options expiration period.

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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.

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The amount of expense, net of income tax, 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.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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Percentage of vesting of share-based compensation awards.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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