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Stock-Based Compensation - Expenses (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2016 | Apr. 30, 2015 | Jul. 31, 2015
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | $ 1,041,000 | $ 1,244,000 | $ 3,166,000 | $ 3,642,000 |
Estimated income tax benefit | (391,000) | (432,000) | (1,103,000) | (1,283,000) |
Net stock-based compensation expense | 650,000 | 812,000 | 2,063,000 | 2,359,000 |
Total remaining unrecognized compensation cost related to the unvested stock-based awards | 7,941,000 |  | 7,941,000 |  |
Estimated forfeitures related to unvested stock-based awards | 743,000 |  | $ 743,000 |  |
Weighted average number of years net compensation cost is expected to be recognized over |  |  | 2 years 10 months 24 days |  |
Stock-based compensation capitalized and included in ending inventory | 51,000 |  | $ 51,000 |  | $ 92,000
Stock Options |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 591,000 | 778,000 | 1,803,000 | 2,267,000 |
Performance Shares |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 369,000 | 308,000 | 1,093,000 | 883,000 |
Employee Stock Purchase Plan - ESPP |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 35,000 | 52,000 | 118,000 | $ 158,000 |
Discount offered to employees participating in the ESPP as a percentage of market price |  |  |  | 15.00% |
RSUs and restricted stock |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 46,000 | 106,000 | 152,000 | $ 306,000 |
Share units |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 0 | 0 | 0 | 28,000 |
Cost of sales |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 70,000 | 71,000 | 233,000 | 204,000 |
Selling, general and administrative expenses |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 875,000 | 1,005,000 | 2,630,000 | 2,963,000 |
Research and development expenses |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | $ 96,000 | $ 168,000 | $ 303,000 | $ 475,000 |
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% |  |

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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