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Equity and Stock-Based Compensation (Stock Options Outstanding and Exercisable) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 1,560,441 |  |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 1,560,441 | 1,841,567 | 1,627,477 | 1,063,324
Options Outstanding, Remaining Contractual Life | 5 years 10 months 2 days |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 7.95 | $ 8.15 | $ 9.11 | $ 7.37
Options Outstanding, Aggregate Intrinsic Value | $ 7,060 |  |  |
Options Outstanding, Number Outstanding, Vested and Expected to Vest (in shares) | 1,559,021 |  |  |
Options Outstanding, Remaining Contractual Life, Vested and Expected to Vest (usd per share) | 5 years 10 months 2 days |  |  |
Options Outstanding, Average Exercise Price, Vested and Expected to Vest (usd per share) | $ 7.95 |  |  |
Options Outstanding, Aggregate Intrinsic Value, Vested and expected to vest | $ 7,052 |  |  |
Options Exercisable, Number Exercisable (in shares) | 1,055,865 | 1,127,611 | 1,002,421 |
Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 8.58 | $ 8.92 | $ 9.74 |
Options Exercisable, Aggregate Intrinsic Value | $ 4,356 |  |  |
2.95-4.87 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 169,459 |  |  |
Options Outstanding, Remaining Contractual Life | 5 years 4 months 9 days |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 3.54 |  |  |
Options Exercisable, Number Exercisable (in shares) | 132,793 |  |  |
Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 3.18 |  |  |
2.95-4.87 | Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | 2.95 |  |  |
2.95-4.87 | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 4.87 |  |  |
5.07-5.20 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 70,990 |  |  |
Options Outstanding, Remaining Contractual Life | 9 years 11 days |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 5.07 |  |  |
Options Exercisable, Number Exercisable (in shares) | 990 |  |  |
Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 5.20 |  |  |
5.07-5.20 | Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | 5.07 |  |  |
5.07-5.20 | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 5.20 |  |  |
5.25-5.25 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 263,936 |  |  |
Options Outstanding, Remaining Contractual Life | 8 years 1 month 17 days |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 5.25 |  |  |
Options Exercisable, Number Exercisable (in shares) | 74,604 |  |  |
Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 5.25 |  |  |
5.25-5.25 | Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | 5.25 |  |  |
5.25-5.25 | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 5.25 |  |  |
5.40-6.15 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 105,520 |  |  |
Options Outstanding, Remaining Contractual Life | 5 years 7 months 2 days |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 5.93 |  |  |
Options Exercisable, Number Exercisable (in shares) | 90,520 |  |  |
Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 5.96 |  |  |
5.40-6.15 | Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | 5.40 |  |  |
5.40-6.15 | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 6.15 |  |  |
7.01-7.01 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 183,176 |  |  |
Options Outstanding, Remaining Contractual Life | 6 years 2 months 11 days |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 7.01 |  |  |
Options Exercisable, Number Exercisable (in shares) | 131,950 |  |  |
Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 7.01 |  |  |
7.01-7.01 | Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | 7.01 |  |  |
7.01-7.01 | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 7.01 |  |  |
7.15-7.87 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 35,234 |  |  |
Options Outstanding, Remaining Contractual Life | 3 years 7 months 24 days |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 7.61 |  |  |
Options Exercisable, Number Exercisable (in shares) | 25,132 |  |  |
Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 7.51 |  |  |
7.15-7.87 | Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | 7.15 |  |  |
7.15-7.87 | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 7.87 |  |  |
7.98-7.98 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 195,273 |  |  |
Options Outstanding, Remaining Contractual Life | 4 years 2 months 16 days |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 7.98 |  |  |
Options Exercisable, Number Exercisable (in shares) | 195,273 |  |  |
Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 7.98 |  |  |
7.98-7.98 | Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | 7.98 |  |  |
7.98-7.98 | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 7.98 |  |  |
8.20-9.94 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 70,707 |  |  |
Options Outstanding, Remaining Contractual Life | 5 years 1 month 2 days |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 8.89 |  |  |
Options Exercisable, Number Exercisable (in shares) | 53,207 |  |  |
Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 9.12 |  |  |
8.20-9.94 | Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | 8,200.00 |  |  |
8.20-9.94 | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 9,940.00 |  |  |
9.98-9.98 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 267,950 |  |  |
Options Outstanding, Remaining Contractual Life | 7 years 1 month 20 days |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 9.98 |  |  |
Options Exercisable, Number Exercisable (in shares) | 155,200 |  |  |
Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 9.98 |  |  |
9.98-9.98 | Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | 9.98 |  |  |
9.98-9.98 | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 9.98 |  |  |
10.50-27.47 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | 198,196 |  |  |
Options Outstanding, Remaining Contractual Life | 2 years 4 months 2 days |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 15.23 |  |  |
Options Exercisable, Number Exercisable (in shares) | 196,196 |  |  |
Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 15.28 |  |  |
10.50-27.47 | Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | 10.50 |  |  |
10.50-27.47 | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Average Exercise Price (usd per share) | $ 27.47 |  |  |

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