Stock-Based Compensation (Options and Common Shares Reserved for Grant) (Details) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2017 USD ($) $ / shares shares
Options Outstanding [Roll Forward]
Options Outstanding, Beginning Balance | shares	3,963
Options Outstanding, Granted | shares	601
Options Outstanding, Exercised | shares	(335)
Options Outstanding, Forfeited / Cancelled | shares	(327)
Options Outstanding, Ending Balance | shares	3,902
Options Outstanding, Exercisable | shares	2,746
Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Beginning Balance	$ 10.36
Weighted Average Exercise Price, Granted	12.86
Weighted Average Exercise Price, Exercised	10.45
Weighted Average Exercise Price, Forfeited / Cancelled	12.68
Weighted Average Exercise Price, Ending Balance	10.54
Weighted Average Exercise Price, Exercisable	$ 10.18
Weighted Average Remaining Contractual Term [Abstract]
Weighted Average Remaining Contractual Term, Outstanding	4 years 2 months 12 days
Weighted Average Remaining Contractual Term, Exercisable	3 years 6 months
Aggregate Intrinsic Value [Abstract]
Aggregate Intrinsic Value, Outstanding | $	$ 3,593
Aggregate Intrinsic Value, Exercisable | $	$ 2,769
Closing Stock Price	$ 10.60