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Earnings Per Share (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2016 | Apr. 30, 2015
Earnings Per Share [Abstract] |  |  |  |
Repurchases of common stock (in shares) |  |  | 0 | 175,735
Weighted Average Number of Shares, Treasury Stock |  | 83,000 |  | 27,000
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Weighted average performance shares outstanding during the period that are excluded from EPS Calculation | 149,000 | 124,000 | 144,000 | 118,000
Net (loss) income for basic calculation | $ (14,355,000) | $ 4,960,000 | $ (10,440,000) | $ 17,770,000
Numerator for diluted calculation | $ (14,355,000) | $ 4,960,000 | $ (10,440,000) | $ 17,770,000
Denominator for basic calculation (in shares) | 16,195,000 | 16,202,000 | 16,184,000 | 16,220,000
Dilutive effect on shares of stock-based awards (in shares) | 0 | 180,000 | 0 | 248,000
Denominator for diluted calculation (in shares) | 16,195,000 | 16,382,000 | 16,184,000 | 16,468,000
Stock options and RSUs [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive equity-classified stock-based awards not included in calculation of diluted earnings per share (in shares) | 2,362,000 | 685,000 | 2,365,000 | 477,000

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1500-109256 + Details
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