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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
 3 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Options Outstanding [Roll Forward]  
Options Outstanding, Beginning Balance (in shares) | shares 3,348
Options Outstanding, Granted (in shares) | shares 594
Options Outstanding, Exercised (in shares) | shares (404)
Options Outstanding, Forfeited / Canceled (in shares) | shares (35)
Options Outstanding, Ending Balance (in shares) | shares 3,503
Options Outstanding, Exercisable (in shares) | shares 2,015
Weighted Average Exercise Price [Roll Forward]  
Weighted Average Exercise Price, Beginning Balance $ 10.85
Weighted Average Exercise Price, Granted 17.71
Weighted Average Exercise Price, Exercised 10.31
Weighted Average Exercise Price, Forfeited / Canceled 11.27
Weighted Average Exercise Price, Ending Balance 12.08
Weighted Average Exercise Price, Exercisable $ 10.58
Weighted Average Remaining Contractual Term [Abstract]  
Weighted Average Remaining Contractual Term, Outstanding 4 years 6 months
Weighted Average Remaining Contractual Term, Exercisable 3 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding | $ $ 19,868 [1]
Aggregate Intrinsic Value, Exercisable | $ $ 14,378 [1]
Closing Stock Price $ 17.72
[1] The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $17.72 as of December 31, 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.