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, 2019 USD ($) $ / shares shares
Options Outstanding [Roll Forward]
Options Outstanding, Beginning Balance | shares	3,526
Options Outstanding, Granted | shares	736
Options Outstanding, Exercised | shares	(540)
Options Outstanding, Forfeited / Cancelled | shares	(374)
Options Outstanding, Ending Balance | shares	3,348
Options Outstanding, Exercisable | shares	2,209
Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Beginning Balance	$ 10.49
Weighted Average Exercise Price, Granted	12.01
Weighted Average Exercise Price, Exercised	9.02
Weighted Average Exercise Price, Forfeited / Cancelled	12.39
Weighted Average Exercise Price, Ending Balance	10.85
Weighted Average Exercise Price, Exercisable	$ 16.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term, Outstanding	4 years
Weighted Average Remaining Contractual Term, Exercisable	3 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding | $	$ 9,295
Aggregate Intrinsic Value, Exercisable | $	$ 7,027
Closing Stock Price	$ 13.62