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Stock-Based Compensation - Expenses (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2017 | Jan. 31, 2016 | Oct. 31, 2016 | Jul. 31, 2016
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before income tax benefit | $ 1,019,000 | $ 1,074,000 | $ 1,989,000 | $ 2,125,000 |  |
Estimated income tax benefit | (361,000) | (347,000) | (702,000) | (712,000) |  |
Net stock-based compensation expense | 658,000 | 727,000 | 1,287,000 | 1,413,000 |  |
Total remaining unrecognized compensation cost related to the unvested stock-based awards | 8,741,000 |  | 8,741,000 |  |  |
Estimated forfeitures related to unvested stock-based awards | 771,000 |  | $ 771,000 |  |  |
Weighted average number of years net compensation cost is expected to be recognized over |  |  | 3 years |  |  |
Stock-based compensation capitalized and included in ending inventory | 51,000 |  | $ 51,000 |  |  | $ 51,000
Stock Options |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before income tax benefit | $ 386,000 | 609,000 | $ 632,000 | 1,212,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 0 |  |  |
Number of stock-based option awards outstanding at period end (in shares) | 1,910,576 |  | 1,910,576 |  | 2,138,174 | 2,256,679
Performance Shares |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before income tax benefit | $ 372,000 | 390,000 | $ 866,000 | 724,000 |  |
Employee Stock Purchase Plan - ESPP |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before income tax benefit | 37,000 | 40,000 | 79,000 | 83,000 |  |
RSUs and restricted stock |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before income tax benefit | $ 224,000 | 35,000 | $ 412,000 | 106,000 |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Number of stock-based option awards outstanding at period end (in shares) | 0 |  | 0 |  |  | 0
Cost of sales |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before income tax benefit | $ 58,000 | 100,000 | $ 106,000 | 163,000 |  |
Selling, general and administrative expenses |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before income tax benefit | 878,000 | 881,000 | 1,729,000 | 1,755,000 |  |
Research and development expenses |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before income tax benefit | $ 83,000 | $ 93,000 | $ 154,000 | $ 207,000 |  |
2001 Employee Stock Purchase Plan | Employee Stock Purchase Plan - ESPP |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Discount offered to employees participating in the ESPP as a percentage of market price |  |  | 15.00% | 15.00% |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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