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Stockholders' Equity Schedule of Stockholders' Equity (Tables) | 3 Months Ended | 6 Months Ended
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Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020
Stockholders' Equity Note [Abstract] |  |  |  |
Schedule of Stockholders Equity [Table Text Block] | The following table illustrates the changes in the balances of each component of stockholders' equity for the three months ended January 31, 2021:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Accumulated Other Comprehensive Loss |  | Total Stockholders' Equity
Balances at October 31, 2020 |  | $ | 548 |  |  | $ | 332,121 |  |  | $ | 726,546 |  |  | $ | (109,146) |  |  | $ | (69,668) |  |  | $ | 880,401 |
Net income |  | — |  |  | — |  |  | 30,860 |  |  | — |  |  | — |  |  | 30,860 |
Other comprehensive income, net of tax |  | — |  |  | — |  |  | — |  |  | — |  |  | 18,207 |  |  | 18,207 |
Issuance of shares of Class A Common Stock under stock plan |  | — |  |  | 59 |  |  | — |  |  | 230 |  |  | — |  |  | 289 |
Stock-based compensation expense |  | — |  |  | 1,897 |  |  | — |  |  | — |  |  | — |  |  | 1,897 |
Repurchase of shares of Class A Common Stock |  | — |  |  | — |  |  | — |  |  | (873) |  |  | — |  |  | (873) |
Cash dividends on Common Stock: |  |  |  |  |  |  |  |  |  |  |  |
Class A — $0.2200 per share |  | — |  |  | — |  |  | (10,667) |  |  | — |  |  | — |  |  | (10,667) |
Class B — $0.2200 per share |  | — |  |  | — |  |  | (779) |  |  | — |  |  | — |  |  | (779) |
Balances at January 31, 2021 |  | $ | 548 |  |  | $ | 334,077 |  |  | $ | 745,960 |  |  | $ | (109,789) |  |  | $ | (51,461) |  |  | $ | 919,335 |
| The following table illustrates the changes in the balances of each component of stockholders' equity for the three months ended January 31, 2020:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Accumulated Other Comprehensive Loss |  | Total Stockholders' Equity
Balances at October 31, 2019 |  | $ | 548 |  |  | $ | 327,241 |  |  | $ | 663,808 |  |  | $ | (43,779) |  |  | $ | (71,283) |  |  | $ | 876,535 |
Net income |  | — |  |  | — |  |  | 33,553 |  |  | — |  |  | — |  |  | 33,553 |
Other comprehensive loss, net of tax |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,207) |  |  | (1,207) |
Issuance of shares of Class A Common Stock under stock plan |  | — |  |  | 187 |  |  | — |  |  | 624 |  |  | — |  |  | 811 |
Tax benefit and withholdings from deferred compensation distributions |  | — |  |  | 69 |  |  | — |  |  | — |  |  | — |  |  | 69 |
Stock-based compensation expense |  | — |  |  | 1,766 |  |  | — |  |  | — |  |  | — |  |  | 1,766 |
Cash dividends on Common Stock: |  |  |  |  |  |  |  |  |  |  |  |
Class A — $0.2175 per share |  | — |  |  | — |  |  | (10,833) |  |  | — |  |  | — |  |  | (10,833) |
Class B — $0.2175 per share |  | — |  |  | — |  |  | (770) |  |  | — |  |  | — |  |  | (770) |
Balances at January 31, 2020 |  | $ | 548 |  |  | $ | 329,263 |  |  | $ | 685,758 |  |  | $ | (43,155) |  |  | $ | (72,490) |  |  | $ | 899,924 |
| The following table illustrates the changes in the balances of each component of stockholders' equity for the six months ended January 31, 2021:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Accumulated Other Comprehensive Loss |  | Total Stockholders' Equity
Balances at July 31, 2020 |  | $ | 548 |  |  | $ | 331,761 |  |  | $ | 704,456 |  |  | $ | (107,216) |  |  | $ | (66,477) |  |  | $ | 863,072 |
Net income |  | — |  |  | — |  |  | 64,341 |  |  | — |  |  | — |  |  | 64,341 |
Other comprehensive income, net of tax |  | — |  |  | — |  |  | — |  |  | — |  |  | 15,016 |  |  | 15,016 |
Issuance of shares of Class A Common Stock under stock plan |  | — |  |  | (3,187) |  |  | — |  |  | 1,020 |  |  | — |  |  | (2,167) |
Tax benefit and withholdings from deferred compensation distributions |  | — |  |  | 32 |  |  | — |  |  | — |  |  | — |  |  | 32 |
Stock-based compensation expense |  | — |  |  | 5,471 |  |  | — |  |  | — |  |  | — |  |  | 5,471 |
Repurchase of shares of Class A Common Stock |  | — |  |  | — |  |  | — |  |  | (3,593) |  |  | — |  |  | (3,593) |
Cash dividends on Common Stock: |  |  |  |  |  |  |  |  |  |  |  |
Class A — $0.4400 per share |  | — |  |  | — |  |  | (21,338) |  |  | — |  |  | — |  |  | (21,338) |
Class B — $0.4234 per share |  | — |  |  | — |  |  | (1,499) |  |  | — |  |  | — |  |  | (1,499) |
Balances at January 31, 2021 |  | $ | 548 |  |  | $ | 334,077 |  |  | $ | 745,960 |  |  | $ | (109,789) |  |  | $ | (51,461) |  |  | $ | 919,335 |
| The following table illustrates the changes in the balances of each component of stockholders' equity for the six months ended January 31, 2020:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Accumulated Other Comprehensive Loss |  | Total Stockholders' Equity
Balances at July 31, 2019 |  | $ | 548 |  |  | $ | 329,969 |  |  | $ | 637,843 |  |  | $ | (46,332) |  |  | $ | (71,254) |  |  | $ | 850,774 |
Net income |  | — |  |  | — |  |  | 71,051 |  |  | — |  |  | — |  |  | 71,051 |
Other comprehensive loss, net of tax |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,236) |  |  | (1,236) |
Issuance of shares of Class A Common Stock under stock plan |  | — |  |  | (6,223) |  |  | — |  |  | 3,177 |  |  | — |  |  | (3,046) |
Tax benefit and withholdings from deferred compensation distributions |  | — |  |  | 133 |  |  | — |  |  | — |  |  | — |  |  | 133 |
Stock-based compensation expense |  | — |  |  | 5,384 |  |  | — |  |  | — |  |  | — |  |  | 5,384 |
Cash dividends on Common Stock: |  |  |  |  |  |  |  |  |  |  |  |
Class A — $0.4350 per share |  | — |  |  | — |  |  | (21,655) |  |  | — |  |  | — |  |  | (21,655) |
Class B — $0.4184 per share |  | — |  |  | — |  |  | (1,481) |  |  | — |  |  | — |  |  | (1,481) |
Balances at January 31, 2020 |  | $ | 548 |  |  | $ | 329,263 |  |  | $ | 685,758 |  |  | $ | (43,155) |  |  | $ | (72,490) |  |  | $ | 899,924 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration