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Stock-Based Compensation - Stock Options (Details) - Stock Options - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2017 | Oct. 31, 2016 | Jan. 31, 2016 | Jan. 31, 2017 | Jan. 31, 2016
Awards (in Shares) |  |  |  |  |
Outstanding, Beginning Balance (in shares) | 2,138,174 | 2,256,679 |  | 2,256,679 |
Expired/canceled (in shares) | (227,598) | (118,505) |  |  |
Exercised (in shares) |  |  | 0 | 0 |
Outstanding, Ending Balance (in shares) | 1,910,576 | 2,138,174 |  | 1,910,576 |
Exercisable, Ending Balance (in shares) | 1,168,372 |  |  | 1,168,372 |
Vested and Expected to Vest, Ending Balance (in shares) | 1,850,536 |  |  | 1,850,536 |
Weighted Average Exercise Price |  |  |  |  |
Outstanding, Beginning Balance (in dollars per share) | $ 28.96 | $ 28.87 |  | $ 28.87 |
Expired/canceled (in dollars per share) | 32.06 | 27.34 |  |  |
Outstanding, Ending Balance (in dollars per share) | 28.59 | $ 28.96 |  | 28.59 |
Exercisable, Ending Balance (in dollars per share) | 28.57 |  |  | 28.57 |
Vested and Expected to Vest, Ending Balance (in dollars per share) | $ 28.58 |  |  | $ 28.58 |
Weighted Average Remaining Contractual Term (Years) |  |  |  |  |
Outstanding, Ending Balance |  |  |  | 6 years 4 days |
Exercisable, Ending Balance |  |  |  | 5 years 2 months 4 days |
Vested And Expected To Vest, Ending Balance |  |  |  | 5 years 11 months 18 days |
Aggregate Intrinsic Value |  |  |  |  |
Outstanding, Ending Balance | $ 0 |  |  | $ 0 |
Exercisable, Ending Balance | 0 |  |  | 0 |
Vested and Expected to Vest, Ending Balance | $ 0 |  |  | $ 0 |
Additional Disclosures |  |  |  |  |
Exercise price, lower range limit (in dollars per share) |  |  |  | $ 12.43 |
Exercise price, upper range limit (in dollars per share) |  |  |  | $ 33.94 |
Granted (in shares) |  |  |  | 0 |
Total intrinsic value of stock-based awards settled |  |  |  |  | $ 32,000
Vested stock based awards net settled upon exercise (in shares) |  |  |  | 0 | 19,200
Common stock issued for net settlement of stock-based awards (in shares) |  |  |  |  | 706
Per share weighted average grant date fair value of stock based awards granted (in dollars per share) |  |  | $ 3.69 |  | $ 5.69
Fair Value Assumptions |  |  |  |  |
Expected dividend yield |  |  | 5.74% |  | 4.32%
Expected volatility |  |  | 34.76% |  | 34.27%
Risk-free interest rate |  |  | 1.64% |  | 1.54%
Expected life (years) |  |  | 5 years 15 days |  | 5 years 1 month 29 days
Minimum |  |  |  |  |
Additional Disclosures |  |  |  |  |
Contractual term (in years) |  |  |  |  | 5 years
Vesting period (in years) |  |  |  |  | 3 years
Maximum |  |  |  |  |
Additional Disclosures |  |  |  |  |
Contractual term (in years) |  |  |  |  | 10 years
Vesting period (in years) |  |  |  |  | 5 years

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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