Stockholder's Investments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
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	$ 0.833
Class A Nonvoting Common Stock Shares Reserved for Outstanding Share-Based Awards	1,843,889
Number of Shares Remaining for Future Issuance of Share-Based Awards	2,605,629
Share-based Compensation Expense	$ 10,504	$ 10,098	$ 8,843
Share-based Compensation Expense, Net of Tax	9,997	9,543	8,048
Share-Based Compensation Cost Not yet Recognized	$ 6,371
Share-Based Compensation Cost Not yet Recognized, Period for Recognition	1 year 7 months 6 days
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	$ 2,446	2,371	2,800
Options, Exercised in Period, Aggregate Intrinsic Value	$ 4,269	$ 1,477	$ 14,692
Options Exercisable, Number	1,050,240	949,668	776,273
Options Exercisable, Weighted Average Exercise Price	$ 38.90	$ 34.97	$ 31.50
Options, Exercised in Period, Proceeds from Issuance of Shares	$ 1,082	$ 1,765	$ 5,511
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	1,067	$ 369	$ 3,673
Options Outstanding, Aggregate Intrinsic Value	11,627
Options Exercisable, Aggregate Intrinsic Value	$ 10,169
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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount, after tax, of expense for award under share-based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Number of shares authorized for issuance under share-based payment arrangement.

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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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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Percentage of vesting of award under share-based payment arrangement.

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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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