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Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020 | Oct. 31, 2020 | Jul. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 919,335 | $ 899,924 | $ 919,335 | $ 899,924 | $ 880,401 | $ 863,072 | $ 876,535 | $ 850,774
Net income | 30,860 | 33,553 | 64,341 | 71,051 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 18,207 | (1,207) | 15,016 | (1,236) |  |  |  |
Issuance of shares of Class A Common Stock under stock plan | (289) | (811) | (2,167) | (3,046) |  |  |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 1,897 | 1,766 | 5,471 | 5,384 |  |  |  |
Tax benefit and withholdings from deferred compensation distributions |  |  | 32 |  |  |  |  |
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation |  | 69 |  | 133 |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | (873) |  | (3,593) |  |  |  |  |
Payment of Ordinary Dividends, Common Stock Class A | (10,667) | (10,833) | (21,338) | (21,655) |  |  |  |
Payment of Ordinary Dividends, Common Stock Class B | (779) | (770) | (1,499) | (1,481) |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 548 | 548 | 548 | 548 | 548 | 548 | 548 | 548
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 334,077 | 329,263 | 334,077 | 329,263 | 332,121 | 331,761 | 327,241 | 329,969
Stock Issued, Value, Stock Options Exercised and Restricted Stock Vested | (59) | (187) | (3,187) | (6,223) |  |  |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 1,897 | 1,766 | 5,471 | 5,384 |  |  |  |
Tax benefit and withholdings from deferred compensation distributions |  | 69 | 32 | 133 |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 745,960 | 685,758 | 745,960 | 685,758 | 726,546 | 704,456 | 663,808 | 637,843
Net income |  |  | 64,341 | 71,051 |  |  |  |
Payment of Ordinary Dividends, Common Stock Class A | (10,667) | (10,833) | (21,338) | (21,655) |  |  |  |
Payment of Ordinary Dividends, Common Stock Class B | (779) | (770) | (1,499) | (1,481) |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (109,789) | (43,155) | (109,789) | (43,155) | (109,146) | (107,216) | (43,779) | (46,332)
Stock Issued, Value, Stock Options Exercised and Restricted Stock Vested | (230) | (624) | (1,020) | (3,177) |  |  |  |
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation |  |  |  | 0 |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | (873) |  | (3,593) |  |  |  |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (51,461) | (72,490) | (51,461) | (72,490) | $ (69,668) | $ (66,477) | $ (71,283) | $ (71,254)
Other Comprehensive Income (Loss), Net of Tax | $ 18,207 | $ (1,207) | $ 15,016 | $ (1,236) |  |  |  |

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