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Net Income per Common Share (Tables) | 6 Months Ended
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Jan. 31, 2018
Earnings Per Share [Abstract] |
Reconciliations of Numerator and Denominator of Basic and Diluted Per Share | Reconciliations of the numerator and denominator of the basic and diluted per share computations for the Company’s Class A and Class B common stock are summarized as follows:
| Three months ended January 31, |  | Six months ended January 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: (in thousands) |  |  |  |  |  |  |
Earnings (Numerator for basic and diluted Class A Nonvoting Common Share) | $ | 4,273 |  |  | $ | 25,297 |  |  | $ | 30,109 |  |  | $ | 47,850 |
Less: |  |  |  |  |  |  |
Preferential dividends | — |  |  | — |  |  | (799 | ) |  | (788 | )
Preferential dividends on dilutive stock options | — |  |  | — |  |  | (16 | ) |  | (14 | )
Numerator for basic and diluted earnings per Class B Voting Common Share | $ | 4,273 |  |  | $ | 25,297 |  |  | $ | 29,294 |  |  | $ | 47,048 |
Denominator: (in thousands) |  |  |  |  |  |  |
Denominator for basic earnings per share for both Class A and Class B | 51,698 |  |  | 51,054 |  |  | 51,569 |  |  | 50,844 |
Plus: Effect of dilutive stock options and restricted stock units | 1,021 |  |  | 900 |  |  | 982 |  |  | 877 |
Denominator for diluted earnings per share for both Class A and Class B | 52,719 |  |  | 51,954 |  |  | 52,551 |  |  | 51,721 |
Net earnings per Class A Nonvoting Common Share: |  |  |  |  |  |  |
Basic | $ | 0.08 |  |  | $ | 0.50 |  |  | $ | 0.58 |  |  | $ | 0.94 |
Diluted | $ | 0.08 |  |  | $ | 0.49 |  |  | $ | 0.57 |  |  | $ | 0.93 |
Net earnings per Class B Voting Common Share: |  |  |  |  |  |  |
Basic | $ | 0.08 |  |  | $ | 0.50 |  |  | $ | 0.57 |  |  | $ | 0.93 |
Diluted | $ | 0.08 |  |  | $ | 0.49 |  |  | $ | 0.56 |  |  | $ | 0.91 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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