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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