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Stockholders' Equity (Tables) | 3 Months Ended
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Oct. 31, 2018 | Oct. 31, 2017
Equity [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 October 31, 2018:
|  | 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 earnings |  | — |  |  | — |  |  | 30,637 |  |  | — |  |  | — |  |  | 30,637 |
Other comprehensive loss, net of tax |  | — |  |  | — |  |  | — |  |  | — |  |  | (9,830 | ) |  | (9,830 | )
Issuance of shares of Class A Common Stock under stock plan |  | — |  |  | (4,505 | ) |  | — |  |  | 14,569 |  |  | — |  |  | 10,064 |
Tax benefit and withholdings from deferred compensation distributions |  | — |  |  | 91 |  |  | — |  |  | — |  |  | — |  |  | 91 |
Stock-based compensation expense (Note H) |  | — |  |  | 4,965 |  |  | — |  |  | — |  |  | — |  |  | 4,965 |
Purchase of shares of Class A Common Stock |  | — |  |  | — |  |  | — |  |  | (1,863 | ) |  | — |  |  | (1,863 | )
Cumulative adjustment for ASU 2014-09, net of tax (Note B) |  | — |  |  | — |  |  | (2,137 | ) |  | — |  |  | — |  |  | (2,137 | )
Cash dividends on Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class A — $0.21 per share |  | — |  |  | — |  |  | (10,403 | ) |  | — |  |  | — |  |  | (10,403 | )
Class B — $0.20 per share |  | — |  |  | — |  |  | (693 | ) |  | — |  |  | — |  |  | (693 | )
Balances at October 31, 2018 |  | $ | 548 |  |  | $ | 326,182 |  |  | $ | 570,858 |  |  | $ | (58,414 | ) |  | $ | (66,231 | ) |  | $ | 772,943 |
| The following table illustrates the changes in the balances of each component of stockholders' equity for the three months ended October 31, 2017:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Accumulated Other Comprehensive Loss |  | Total Stockholders' Equity
Balances at July 31, 2017 |  | $ | 548 |  |  | $ | 322,608 |  |  | $ | 507,136 |  |  | $ | (85,470 | ) |  | $ | (44,682 | ) |  | $ | 700,140 |
Net earnings |  | — |  |  | — |  |  | 25,836 |  |  | — |  |  | — |  |  | 25,836 |
Other comprehensive loss, net of tax |  | — |  |  | — |  |  | — |  |  | — |  |  | (7,380 | ) |  | (7,380 | )
Issuance of shares of Class A Common Stock under stock plan |  | — |  |  | (3,863 | ) |  | — |  |  | 5,086 |  |  | — |  |  | 1,223 |
Tax benefit and withholdings from deferred compensation distributions |  | — |  |  | 168 |  |  | — |  |  | (422 | ) |  | — |  |  | (254 | )
Stock-based compensation expense (Note H) |  | — |  |  | 3,744 |  |  | — |  |  | — |  |  | — |  |  | 3,744 |
Cash dividends on Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class A — $0.21 per share |  | — |  |  | — |  |  | (9,964 | ) |  | — |  |  | — |  |  | (9,964 | )
Class B — $0.19 per share |  | — |  |  | — |  |  | (675 | ) |  | — |  |  | — |  |  | (675 | )
Balances at October 31, 2017 |  | $ | 548 |  |  | $ | 322,657 |  |  | $ | 522,333 |  |  | $ | (80,806 | ) |  | $ | (52,062 | ) |  | $ | 712,670 |

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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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