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v3.20.1

Stockholders' Equity (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019 | Jun. 19, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock repurchased (in shares) | 0 | 0 | 0 | 0 |
Stock repurchased | $ 0 | $ 0 | $ 0 | $ 0 |
Performance Shares (PSUs) | Share-based Compensation Award, Tranche Two | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentages |  |  | 50.00% |  |
Performance Shares (PSUs) | Share-based Compensation Award, Tranche Two | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentages |  |  | 150.00% |  |
Performance Shares (PSUs) | Share-based Compensation Award, Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentages |  |  | 50.00% |  |
Performance Shares (PSUs) | Share-based Compensation Award, Tranche Three |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentages |  |  | 15000.00% |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation | $ 5,062,000 | $ 4,956,000 | $ 10,075,000 | $ 9,486,000 |
Stock repurchase program authorized amount |  |  |  |  | $ 250,000,000

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