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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, 2018 USD ($) $ / shares shares
Options Outstanding [Roll Forward]
Options Outstanding, Beginning Balance | shares	3,902
Options Outstanding, Granted | shares	863
Options Outstanding, Exercised | shares	(597)
Options Outstanding, Forfeited / Cancelled | shares	(642)
Options Outstanding, Ending Balance | shares	3,526
Options Outstanding, Exercisable | shares	2,245
Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Beginning Balance	$ 10.54
Weighted Average Exercise Price, Granted	10.92
Weighted Average Exercise Price, Exercised	9.14
Weighted Average Exercise Price, Forfeited / Cancelled	12.64
Weighted Average Exercise Price, Ending Balance	10.49
Weighted Average Exercise Price, Exercisable	$ 10.09
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 4 months
Aggregate Intrinsic Value [Abstract]
Aggregate Intrinsic Value, Outstanding | $	$ 10,470
Aggregate Intrinsic Value, Exercisable | $	$ 7,558
Closing Stock Price	$ 13.45

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Price of a single share of a number of saleable stocks of a company.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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