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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
 9 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Options Outstanding [Roll Forward]  
Options Outstanding, Beginning Balance (in shares) | shares 3,526
Options Outstanding, Granted (in shares) | shares 606
Options Outstanding, Exercised (in shares) | shares (448)
Options Outstanding, Forfeited / Canceled (in shares) | shares (346)
Options Outstanding, Ending Balance (in shares) | shares 3,338
Options Outstanding, Exercisable (in shares) | shares 2,226
Weighted Average Exercise Price [Roll Forward]  
Weighted Average Exercise Price, Beginning Balance $ 10.49
Weighted Average Exercise Price, Granted 11.64
Weighted Average Exercise Price, Exercised 9.04
Weighted Average Exercise Price, Forfeited / Canceled 12.52
Weighted Average Exercise Price, Ending Balance 10.68
Weighted Average Exercise Price, Exercisable $ 10.34
Weighted Average Remaining Contractual Term [Abstract]  
Weighted Average Remaining Contractual Term, Outstanding 4 years 1 month 6 days
Weighted Average Remaining Contractual Term, Exercisable 3 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding | $ $ 6,983 [1]
Aggregate Intrinsic Value, Exercisable | $ $ 5,418 [1]
Closing Stock Price $ 12.68
[1] The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $12.68 as of June 30, 2019, which would have been received by the option holders had all option holders exercised their options as of that date. The intrinsic value of an option is the amount by which the fair value of the underlying stock exceeds its exercise price.