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Description of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Jul. 31, 2019
Accounting Policies [Abstract] |
Schedule of weighted-average number of shares used in the calculation of basic and diluted earnings per share |
Year ended July 31 (in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Basic weighted-average number of shares |  |  | 25,293 |  |  |  | 24,655 |  |  |  | 23,182 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | — |  |  |  | 9 |  |  |  | 44 |
Non-vested restricted Class B common stock |  |  | 15 |  |  |  | 54 |  |  |  | 83 |
Diluted weighted-average number of shares |  |  | 25,308 |  |  |  | 24,718 |  |  |  | 23,309 |
Schedule of outstanding stock options excluded from the calculation of diluted earnings per share |
Year ended July 31 (in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Shares excluded from the calculation of diluted earnings per share |  |  | 1,204 |  |  |  | 1,142 |  |  |  | 22 |
Schedule of change in the allowance for doubtful accounts |
Year ended July 31 (in thousands) |  | Balance at beginning of year |  |  | Additions charged to costs and expenses |  |  | Deductions (1) |  |  | Balance at end of year |
2019 |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 5,358 |  |  | $ | 2,028 |  |  | $ | (1,942 | ) |  | $ | 5,444 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 5,207 |  |  | $ | 2,199 |  |  | $ | (2,048 | ) |  | $ | 5,358 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 4,818 |  |  | $ | 686 |  |  | $ | (297 | ) |  | $ | 5,207 |
| (1) | Primarily uncollectible accounts written off, net of recoveries.

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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