Equity and Stock-Based Compensation (Stock Options Valuation) (Details) - $ / shares	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate	2.89%
Expected life	6 years
Dividend rate	0.00%
Volatility	58.76%
Options [Roll Forward]
Outstanding at end of period (in shares)	1,248,758
Options Exercisable
Exercisable at end of period (in shares)	1,014,300
Exercisable at end of period, weighted average exercise price (dollars per share)	$ 7.93
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate		2.00%	2.00%
Expected life		6 years	6 years
Dividend rate		0.00%	0.00%
Volatility		63.00%	63.00%
Options [Roll Forward]
Outstanding at beginning of period (in shares)	1,560,441	1,841,567	1,627,477
Granted (in shares)	44,000	145,000	360,075
Exercised (in shares)	(277,154)	(317,986)	(15,346)
Forfeited/canceled (in shares)	(78,529)	(108,140)	(130,639)
Outstanding at end of period (in shares)	1,248,758	1,560,441	1,841,567
Options Exercisable
Outstanding at beginning of period (dollars per share)	$ 7.95	$ 8.15	$ 9.11
Granted (dollars per share)	7.40	5.23	5.25
Exercised (dollars per share)	6.71	6.30	3.28
Forfeited (dollars per share)	16.12	12.71	12.86
Outstanding at end of period (dollars per share)	$ 7.69	$ 7.95	$ 8.15
Exercisable at end of period (in shares)	1,014,300	1,055,865	1,127,611
Exercisable at end of period, weighted average exercise price (dollars per share)	$ 7.93	$ 8.58	$ 8.92
Weighted average grant-date fair value of options granted during the period (dollars per share)	$ 4.20	$ 3.04	$ 3.03

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.

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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.