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Equity and Stock-Based Compensation (Stock Options Outstanding and Exercisable) (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 1,248,758 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 1,014,300 |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.93 |  |  |
Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 1,248,758 | 1,560,441 | 1,841,567 | 1,627,477
Remaining Contractual Life | 5 years 11 days |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.69 | $ 7.95 | $ 8.15 | $ 9.11
Options Exercisable |  |  |  |
Number Exercisable | 1,014,300 | 1,055,865 | 1,127,611 |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.93 | $ 8.58 | $ 8.92 |
2.95-5.07 | Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 173,154 |  |  |
Remaining Contractual Life | 5 years 9 months 4 days |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 3.99 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 112,321 |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 3.45 |  |  |
2.95-5.07 | Stock Options | Minimum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | 2.95 |  |  |
2.95-5.07 | Stock Options | Maximum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 5.07 |  |  |
5.20-5.20 | Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 990 |  |  |
Remaining Contractual Life | 11 months 16 days |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 5.20 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 990 |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 5.20 |  |  |
5.20-5.20 | Stock Options | Minimum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | 5.2 |  |  |
5.20-5.20 | Stock Options | Maximum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 5.20 |  |  |
5.25-5.25 | Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 204,524 |  |  |
Remaining Contractual Life | 6 years 11 months 5 days |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 5.25 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 137,024 |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 5.25 |  |  |
5.25-5.25 | Stock Options | Minimum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | 5.25 |  |  |
5.25-5.25 | Stock Options | Maximum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 5.25 |  |  |
5.40-6.15 | Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 79,319 |  |  |
Remaining Contractual Life | 4 years 11 months 12 days |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 5.91 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 71,819 |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 5.93 |  |  |
5.40-6.15 | Stock Options | Minimum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | 5.40 |  |  |
5.40-6.15 | Stock Options | Maximum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 6.15 |  |  |
7.01-7.01 | Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 160,225 |  |  |
Remaining Contractual Life | 4 years 8 months 27 days |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.01 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 160,225 |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.01 |  |  |
7.01-7.01 | Stock Options | Minimum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | 7.01 |  |  |
7.01-7.01 | Stock Options | Maximum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.01 |  |  |
7.15-7.87 | Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 68,315 |  |  |
Remaining Contractual Life | 7 years 2 months 9 days |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.50 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 24,315 |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.69 |  |  |
7.15-7.87 | Stock Options | Minimum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | 7.15 |  |  |
7.15-7.87 | Stock Options | Maximum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.87 |  |  |
7.98-7.98 | Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 186,533 |  |  |
Remaining Contractual Life | 3 years 18 days |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.98 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 186,533 |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.98 |  |  |
7.98-7.98 | Stock Options | Minimum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | 7.98 |  |  |
7.98-7.98 | Stock Options | Maximum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 7.98 |  |  |
8.20-9.94 | Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 21,191 |  |  |
Remaining Contractual Life | 3 years 2 months 16 days |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 9.31 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 17,441 |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 9.55 |  |  |
8.20-9.94 | Stock Options | Minimum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | 8,200.00 |  |  |
8.20-9.94 | Stock Options | Maximum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 9,940.00 |  |  |
9.98-9.98 | Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 228,300 |  |  |
Remaining Contractual Life | 5 years 9 months 22 days |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 9.98 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 177,425 |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 9.98 |  |  |
9.98-9.98 | Stock Options | Minimum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | 9.98 |  |  |
9.98-9.98 | Stock Options | Maximum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 9.98 |  |  |
10.50-22.26 | Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding (in shares) | 126,207 |  |  |
Remaining Contractual Life | 2 years 1 month 13 days |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 13.99 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 126,207 |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 13.99 |  |  |
10.50-22.26 | Stock Options | Minimum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | 10.50 |  |  |
10.50-22.26 | Stock Options | Maximum |  |  |  |
Options Outstanding |  |  |  |
Weighted Average Exercise Price Per Share (dollars per share) | $ 22.26 |  |  |

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