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Stockholders' Equity Schedule of Stockholders' Equity (Tables) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019
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 April 30, 2020:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Accumulated Other Comprehensive Loss |  | Total Stockholders' Equity
Balances at January 31, 2020 |  | $ | 548 |  |  | $ | 329,263 |  |  | $ | 685,758 |  |  | $ | (43,155) |  |  | $ | (72,490) |  |  | $ | 899,924 |
Net income |  | — |  |  | — |  |  | 13,633 |  |  | — |  |  | — |  |  | 13,633 |
Other comprehensive loss, net of tax |  | — |  |  | — |  |  | — |  |  | — |  |  | (19,752) |  |  | (19,752) |
Issuance of shares of Class A Common Stock under stock plan |  | — |  |  | (91) |  |  | — |  |  | 517 |  |  | — |  |  | 426 |
Stock-based compensation expense |  | — |  |  | 1,796 |  |  | — |  |  | — |  |  | — |  |  | 1,796 |
Repurchase of shares of Class A Common Stock |  | — |  |  | — |  |  | — |  |  | (64,113) |  |  | — |  |  | (64,113) |
Cash dividends on Common Stock: |  |  |  |  |  |  |  |  |  |  |  |
Class A — $0.22 per share |  | — |  |  | — |  |  | (10,542) |  |  | — |  |  | — |  |  | (10,542) |
Class B — $0.22 per share |  | — |  |  | — |  |  | (770) |  |  | — |  |  | — |  |  | (770) |
Balances at April 30, 2020 |  | $ | 548 |  |  | $ | 330,968 |  |  | $ | 688,079 |  |  | $ | (106,751) |  |  | $ | (92,242) |  |  | $ | 820,602 |
| The following table illustrates the changes in the balances of each component of stockholders' equity for the three months ended April 30, 2019:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Accumulated Other Comprehensive Loss |  | Total Stockholders' Equity
Balances at January 31, 2019 |  | $ | 548 |  |  | $ | 328,978 |  |  | $ | 588,918 |  |  | $ | (54,498) |  |  | $ | (60,565) |  |  | $ | 803,381 |
Net income |  | — |  |  | — |  |  | 34,781 |  |  | — |  |  | — |  |  | 34,781 |
Other comprehensive loss, net of tax |  | — |  |  | — |  |  | — |  |  | — |  |  | (7,881) |  |  | (7,881) |
Issuance of shares of Class A Common Stock under stock plan |  | — |  |  | (1,433) |  |  | — |  |  | 4,415 |  |  | — |  |  | 2,982 |
Stock-based compensation expense |  | — |  |  | 2,506 |  |  | — |  |  | — |  |  | — |  |  | 2,506 |
Cash dividends on Common Stock: |  |  |  |  |  |  |  |  |  |  |  |
Class A — $0.21 per share |  | — |  |  | — |  |  | (10,473) |  |  | — |  |  | — |  |  | (10,473) |
Class B — $0.21 per share |  | — |  |  | — |  |  | (752) |  |  | — |  |  | — |  |  | (752) |
Balances at April 30, 2019 |  | $ | 548 |  |  | $ | 330,051 |  |  | $ | 612,474 |  |  | $ | (50,083) |  |  | $ | (68,446) |  |  | $ | 824,544 |
| The following table illustrates the changes in the balances of each component of stockholders' equity for the nine months ended April 30, 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 |  | — |  |  | — |  |  | 84,684 |  |  | — |  |  | — |  |  | 84,684 |
Other comprehensive loss, net of tax |  | — |  |  | — |  |  | — |  |  | — |  |  | (20,988) |  |  | (20,988) |
Issuance of shares of Class A Common Stock under stock plan |  | — |  |  | (6,314) |  |  | — |  |  | 3,694 |  |  | — |  |  | (2,620) |
Tax benefit and withholdings from deferred compensation distributions |  | — |  |  | 133 |  |  | — |  |  | — |  |  | — |  |  | 133 |
Stock-based compensation expense |  | — |  |  | 7,180 |  |  | — |  |  | — |  |  | — |  |  | 7,180 |
Repurchase of shares of Class A Common Stock |  | — |  |  | — |  |  | — |  |  | (64,113) |  |  | — |  |  | (64,113) |
Cash dividends on Common Stock: |  |  |  |  |  |  |  |  |  |  |  |
Class A — $0.65 per share |  | — |  |  | — |  |  | (32,197) |  |  | — |  |  | — |  |  | (32,197) |
Class B — $0.64 per share |  | — |  |  | — |  |  | (2,251) |  |  | — |  |  | — |  |  | (2,251) |
Balances at April 30, 2020 |  | $ | 548 |  |  | $ | 330,968 |  |  | $ | 688,079 |  |  | $ | (106,751) |  |  | $ | (92,242) |  |  | $ | 820,602 |
| The following table illustrates the changes in the balances of each component of stockholders' equity for the nine months ended April 30, 2019:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Accumulated Other Comprehensive Loss |  | Total Stockholders' Equity
Balances at July 31, 2018 |  | $ | 548 |  |  | $ | 325,631 |  |  | $ | 553,454 |  |  | $ | (71,120) |  |  | $ | (56,401) |  |  | $ | 752,112 |
Net income |  | — |  |  | — |  |  | 94,645 |  |  | — |  |  | — |  |  | 94,645 |
Other comprehensive loss, net of tax |  | — |  |  | — |  |  | — |  |  | — |  |  | (12,045) |  |  | (12,045) |
Issuance of shares of Class A Common Stock under stock plan |  | — |  |  | (6,100) |  |  | — |  |  | 24,219 |  |  | — |  |  | 18,119 |
Tax benefit and withholdings from deferred compensation distributions |  | — |  |  | 209 |  |  | — |  |  | — |  |  | — |  |  | 209 |
Stock-based compensation expense |  | — |  |  | 10,311 |  |  | — |  |  | — |  |  | — |  |  | 10,311 |
Repurchase of shares of Class A Common Stock |  | — |  |  | — |  |  | — |  |  | (3,182) |  |  | — |  |  | (3,182) |
Adoption of ASU 2014-09, "Revenue from Contracts with Customers" |  | — |  |  | — |  |  | (2,137) |  |  | — |  |  | — |  |  | (2,137) |
Cash dividends on Common Stock: |  |  |  |  |  |  |  |  |  |  |  |
Class A — $0.64 per share |  | — |  |  | — |  |  | (31,291) |  |  | — |  |  | — |  |  | (31,291) |
Class B — $0.62 per share |  | — |  |  | — |  |  | (2,197) |  |  | — |  |  | — |  |  | (2,197) |
Balances at April 30, 2019 |  | $ | 548 |  |  | $ | 330,051 |  |  | $ | 612,474 |  |  | $ | (50,083) |  |  | $ | (68,446) |  |  | $ | 824,544 |

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration