Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Oct. 31, 2020	Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from exercise of stock options	$ 160	$ 3,411
Stock-Based Compensation Expense
Share-based compensation expense	3,574	3,618
Share-based compensation expense, net of tax	3,300	3,089
Unrealized compensation cost related to share-based compensation, pre tax	$ 14,460
Weighted average period remaining	2 years 2 months 12 days
Stock Options, Additional Disclosures
Fair value of options vested	$ 2,371	2,537
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	93	2,541
Service-Based RSUs, Additional Disclosures
Time-Based RSUs, Vested in Period, Fair Value	5,844	8,708
Options, Exercises in Period, Intrinsic Value	$ 373	$ 10,225
Service Based Restricted Shares and Restricted Stock Units [Member]
Service-Based RSUs, Additional Disclosures
Service-Based RSUs, Grants in Period, Weighted Average Grant Date Fair Value	$ 39.92

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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

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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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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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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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